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# algorithm-primer

>
> algorithm primer - 算法基础、Leetcode编程、剑指offer
>

# 目录

- [算法基础](#summary/algorithm-summary.md)
- [Leetcode编程](#Leetcode编程)
    * [**Leetcode编程源码**](leetcode/src/main/java/leetcode) 
    * [Top 100 Liked Questions](#Top-100-Liked-Questions)  
    * [Leetcode all questions](#All-Questions)  
    * [Leetcode Summary](summary/leetcode-summary.md) 
    * [Leetcode Category](#Leetcode-Category) 
        * [数组与矩阵](#数组与矩阵)
        * [链表](#链表)
        * [栈与队列](#栈与队列)
        * [字符串](#字符串)
        * [哈希表](#哈希表)
        * [树](#树)
          * [二叉树](#二叉树)
          * [二叉搜索树](#二叉搜索树)
          * [字典树](#字典树)
        * [图](#图)
        * [位运算](#位运算)
        * [排序](#排序)
          * [排序应用](#排序应用)            
          * [拓扑排序](#拓扑排序)            
        * [二分查找](#二分查找)
        * [双指针](#双指针)
        * [贪心](#贪心)
        * [分治](#分治)
        * [搜索](#搜索)
          * [BFS](#BFS)
          * [DFS](#DFS)
          * [回溯](#回溯)
        * [递归与动态规划](#递归与动态规划)
- [剑指offer](#剑指offer)
    * [**剑指offerV2源码**](interview-for-offer/src/main/java/offerV2)  
    * [剑指offer V2](#剑指offer-V2)
    * [剑指offer V1](#剑指offer-V1)
    * [剑指offer Summary](summary/interviewforoffer-summary.md)  
    * [剑指offer V2分类](#剑指offer-V2分类)
        * [数组](#剑指offer-数组与哈希表)
        * [链表](#剑指offer-链表)
        * [二叉树](#剑指offer-二叉树)
        * [栈与队列](#剑指offer-栈与队列)
        * [字符串](#剑指offer-字符串)
        * [位运算](#剑指offer-位运算)
        * [递归与动态规划](#剑指offer-递归与动态规划)
- [参考](#参考)

---

# Leetcode编程

## Leetcode Category

### 栈与队列
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  20  | 有效的括号 Valid Parentheses | [Java](leetcode/src/main/java/leetcode/_0020_ValidParentheses.java) | Easy |  | 
|  94  | 二叉树的中序遍历 Binary Tree Inorder | [Java](leetcode/src/main/java/leetcode/_0094_BinaryTreeInorderTraversal.java)  | Medium |  |
| 155  | 最小栈 Min Stack | [Java](leetcode/src/main/java/leetcode/_0155_MinStack.java) | Easy |  | 
| 394  | 字符串编码 Decode String | [Java](leetcode/src/main/java/leetcode/_0394_DecodeString.java) | Medium |  |

### 链表
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|   2  | 两数相加 Add Two Numbers | [Java](leetcode/src/main/java/leetcode/_0002_AddTwoNumbers.java) | Medium |  |
|  19  | 删除链表倒数第N个节点 Remove Nth Node From End of List | [Java](leetcode/src/main/java/leetcode/_0019_RemoveNthNodeFromEndOfList.java) | Medium |  |
|  21  | 合并两个有序链表 Merge Two Sorted Lists | [Java](leetcode/src/main/java/leetcode/_0021_MergeTwoSortedLists.java) | Easy |  | 
| 141  | 判断链表是是否存在环 Linked List Cycle | [Java](leetcode/src/main/java/leetcode/_0141_LinkedListCycle.java) |  Easy |  |   
| 142  | 环形链表II Linked List Cycle II | [Java](leetcode/src/main/java/leetcode/_0142_LinkedListCycleII.java) |  Medium |  | 
| 148  | 排序链表 Sort List | [Java](leetcode/src/main/java/leetcode/_0148_SortList.java) | Medium | |  
| 160  | 相交链表 Intersection of Two Linked Lists | [Java](leetcode/src/main/java/leetcode/_0160_IntersectionOfTwoLinkedLists.java) | Easy |  | 
| 206  | 反转链表 Reverse Linked List | [Java](leetcode/src/main/java/leetcode/_0206_ReverseLinkedList.java) | Easy |  |
| 234  | 回文链表 Palindrome Linked List | [Java](leetcode/src/main/java/leetcode/_0234_PalindromeLinkedList.java) | Easy |  |

### 数组与矩阵
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
| 105  | Construct Binary Tree from Preorder and Inorder Traversal | [Java](leetcode/src/main/java/leetcode/_0105_ConstructBinaryTreeFromPreorderAndInorderTraversal.java) |  Medium |  | 
| 121  | Best Time to Buy and Sell Stock | [Java](leetcode/src/main/java/leetcode/_0121_BestTimeToBuyAndSellSock.java) | Easy |  |  
| 152  | Maximum Product Subarray | [Java](leetcode/src/main/java/leetcode/_0152_MaximumProductSubarray.java) | Medium | |  
| 169  | Majority Element | [Java](leetcode/src/main/java/leetcode/_0169_MajorityElement.java) | Easy |  | 
| 238  | Product of Array Except Self | [Java](leetcode/src/main/java/leetcode/_0238_ProductOfArrayExceptSelf.java)  | Medium |  |
| 283  | Move Zeroes | [Java](leetcode/src/main/java/leetcode/_0283_MoveZeroes.java) | Easy |  |
| 287  | Find the Duplicate Number | [Java](leetcode/src/main/java/leetcode/_0287_FindTheDuplicateNumber.java) |  Medium |  | 
| 448  | Find All Numbers Disappeared in an Array | [Java](leetcode/src/main/java/leetcode/_0448_FindAllNumbersDisappearedInAnArray.java) | Easy |  |
| 560  | Subarray Sum Equals K | [Java](leetcode/src/main/java/leetcode/_0560_SubarraySumEqualsK.java) | Medium |  |
| 581  | Shortest Unsorted Continuous Subarray | [Java](leetcode/src/main/java/leetcode/_581_ShortestUnsortedContinuousSubarray.java) | Easy |  |

### 树
#### 二叉树
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  94  | 二叉树的中序遍历 Binary Tree Inorder | [Java](leetcode/src/main/java/leetcode/_0094_BinaryTreeInorderTraversal.java)  | Medium |  |
| 101  | 对称二叉树 Symmetric Tree | [Java](leetcode/src/main/java/leetcode/_0101_SymmetricTree.java) | Easy |  |
| 102  | 二叉树的层次遍历 Binary Tree Level Order Traversal | [Java](leetcode/src/main/java/leetcode/_0102_BinaryTreeLevelOrderTraversal.java) |  Medium |  |
| 104  | 二叉树的最大深度 Maximum Depth of Binary Tree | [Java](leetcode/src/main/java/leetcode/_0104_MaximumDepthOfBinaryTree.java) | Easy |  |
| 105  | 从前序与中序遍历序列构造二叉树 Construct Binary Tree from Preorder and Inorder Traversal | [Java](leetcode/src/main/java/leetcode/_0105_ConstructBinaryTreeFromPreorderAndInorderTraversal.java) |  Medium |  | 
| 114  | 二叉树展开为链表 Flatten Binary Tree to Linked List | [Java](leetcode/src/main/java/leetcode/_0114_FlattenBinaryTreeToLinkedList.java) | Medium |  |  
| 124  | 二叉树中的最大路径和 Binary Tree Maximum Path Sum | [Java](leetcode/src/main/java/leetcode/_0124_BinaryTreeMaximumPathSum.java) |  Hard |  |
| 226  | 翻转二叉树 Invert Binary Tree | [Java](leetcode/src/main/java/leetcode/_0226_InvertBinaryTree.java) | Easy |  | 
| 236  | 二叉树的最近公共祖先 Lowest Common Ancestor of a Binary Tree | [Java](leetcode/src/main/java/leetcode/_0236_LowestCommonAncestorOfABinaryTree.java) | Medium |  | 
| 257  | 二叉树路径 Binary Tree Paths | [Java](leetcode/src/main/java/leetcode/_0257_BinaryTreePaths.java)  | Easy |  |
| 337  | 打家劫舍 III House Robber III | [Java](leetcode/src/main/java/leetcode/_0337_HouseRobberIII.java) | Medium |  | 
| 437  | 路径总和 III Path Sum III | [Java](leetcode/src/main/java/leetcode/_0437_PathSumIII.java) | Easy |  | 
| 543  | 二叉树的直径 Diameter of Binary Tree | [Java](leetcode/src/main/java/leetcode/_0543_DiameterOfBinaryTree.java) | Easy | |  
| 617  | 合并二叉树 Merge Two Binary Trees | [Java](leetcode/src/main/java/leetcode/_0617_MergeTwoBinaryTrees.java) | Easy |  |

#### 二叉搜索树
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  96  | 不同的二叉搜索树 Unique Binary Search Trees | [Java](leetcode/src/main/java/leetcode/_0096_UniqueBinarySearchTrees.java) | Medium |  | 
|  98  | 验证二叉搜索树 Validate Binary Search Tree | [Java](leetcode/src/main/java/leetcode/_0098_ValidateBinarySearchTree.java)  | Medium |  |
| 538  | 把二叉搜索树转换为累加树 Convert BST to Greater Tree | [Java](leetcode/src/main/java/leetcode/_0538_ConvertBSTToGreaterTree.java) | Easy | |

#### 字典树
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
| 208  | 实现 Trie (前缀树) Implement Trie (Prefix Tree) | [Java](leetcode/src/main/java/leetcode/_0208_ImplementTrie.java) | Medium |  |

### 哈希表
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|   1  | 两数之和 Two Sum | [Java](leetcode/src/main/java/leetcode/_0001_TwoSum.java) | Easy | |
|   3  | 无重复字符的最长子串 Longest Substring Without Repeating Characters | [Java](leetcode/src/main/java/leetcode/_0003_LongestSubstringWithoutRepeatingCharacters.java) | Medium |  |
|  49  | 字母异位词分组 Group Anagrams | [Java](leetcode/src/main/java/leetcode/_0049_GroupAnagrams.java) | Medium |  |
|  94  | 二叉树的中序遍历 Binary Tree Inorder | [Java](leetcode/src/main/java/leetcode/_0094_BinaryTreeInorderTraversal.java)  | Medium |  |
| 136  | 只出现一次的数字 Single Number  | [Java](leetcode/src/main/java/leetcode/_0136_SingleNumber.java) | Easy |  |
| 347  | 前 K 个高频元素 Top K Frequent Elements | [Java](leetcode/src/main/java/leetcode/_0347_TopKFrequentElements.java) |  Medium | |
| 438  | 找到字符串中所有字母异位词 Find All Anagrams in a String | [Java](leetcode/src/main/java/leetcode/_0438_FindAllAnagramsInAString.java) | Medium |  |  
| 560  | 和为K的子数组 Subarray Sum Equals K | [Java](leetcode/src/main/java/leetcode/_0560_SubarraySumEqualsK.java) | Medium |  |

### 字符串
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|   3  | 无重复字符的最长子串 Longest Substring Without Repeating Characters | [Java](leetcode/src/main/java/leetcode/_0003_LongestSubstringWithoutRepeatingCharacters.java) | Medium |  |
|   5  | 最长回文子串 Longest Palindromic Substring | [Java](leetcode/src/main/java/leetcode/_0005_LongestPalindromicSubstring.java) | Medium |  |
|  17  | 电话号码的字母组合 Letter Combinations of a Phone Number | [Java](leetcode/src/main/java/leetcode/_0017_LetterCombinationsOfAPhoneNumber.java) | Medium |  |
|  20  | 有效的括号 Valid Parentheses | [Java](leetcode/src/main/java/leetcode/_0020_ValidParentheses.java) | Easy |  | 
|  22  | 括号生成 Generate Parentheses | [Java](leetcode/src/main/java/leetcode/_0022_GenerateParentheses.java) | Medium |  | 
|  49  | 字母异位词分组 Group Anagrams | [Java](leetcode/src/main/java/leetcode/_0049_GroupAnagrams.java) | Medium |  |
| 647  | 回文子串 Palindromic Substrings | [Java](leetcode/src/main/java/leetcode/_0647_PalindromicSubstrings.java) | Medium |  |

### 堆
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
| 215  | 数组中的第K个最大元素 Kth Largest Element in an Array | [Java](leetcode/src/main/java/leetcode/_0215_KthLargestElementInAnArray.java) | Medium | | 
| 347  | 前 K 个高频元素 Top K Frequent Elements | [Java](leetcode/src/main/java/leetcode/_0347_TopKFrequentElements.java) |  Medium | |

---

### 排序

#### 排序应用
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  56  | 合并区间 Merge Intervals | [Java](leetcode/src/main/java/leetcode/_0056_MergeIntervals.java) | Medium | | 
|  75  | 颜色分类 Sort Colors | [Java](leetcode/src/main/java/leetcode/_0075_SortColors.java) | Medium | |
| 148  | 排序链表 Sort List | [Java](leetcode/src/main/java/leetcode/_0148_SortList.java) | Medium | |

#### 拓扑排序
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
| 207  | 课程表 Course Schedule | [Java](leetcode/src/main/java/leetcode/_0207_CourseSchedule.java) |  Medium |  |

---

### 二分查找
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  34  | 在排序数组中查找元素的第一个和最后一个位置 Find First and Last Position of Element in Sorted Array | [Java](leetcode/src/main/java/leetcode/_0034_FirstAndLastPositionOfElementInSortedArray.java) | Medium |  |
| 240  | 搜索二维矩阵 II Search a 2D Matrix II | [Java](leetcode/src/main/java/leetcode/_0240_SearchA2DMatrixII.java) | Medium |  |
| 287  | 寻找重复数 Find the Duplicate Number | [Java](leetcode/src/main/java/leetcode/_0287_FindTheDuplicateNumber.java) |  Medium |  | 
| 300  | 最长上升子序列 Longest Increasing Subsequence | [Java](leetcode/src/main/java/leetcode/_0300_LongestIncreasingSubsequence.java) | Medium |  |

### 双指针
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|   3  | 无重复字符的最长子串 Longest Substring Without Repeating Characters | [Java](leetcode/src/main/java/leetcode/_0003_LongestSubstringWithoutRepeatingCharacters.java) | Medium |  |
|  11  | 盛最多水的容器 Container With Most Water | [Java](leetcode/src/main/java/leetcode/_0011_ContainerWithMostWater.java) | Medium |  |
|  15  | 三数之和 3Sum | [Java](leetcode/src/main/java/leetcode/_0015_3Sum.java) | Medium |  |
|  16  | 最接近的三数之和 3Sum Closest | [Java](leetcode/src/main/java/leetcode/_0016_3SumClosest.java) | Medium |  |
|  19  | 删除链表的倒数第N个节点 Remove Nth Node From End of List | [Java](leetcode/src/main/java/leetcode/_0019_RemoveNthNodeFromEndOfList.java) | Medium |  |
|  75  | 颜色分类 Sort Colors | [Java](leetcode/src/main/java/leetcode/_0075_SortColors.java) | Medium |  |
| 141  | 环形链表 Linked List Cycle | [Java](leetcode/src/main/java/leetcode/_0141_LinkedListCycle.java) |  Easy |  |   
| 142  | 环形链表 II Linked List Cycle II | [Java](leetcode/src/main/java/leetcode/_0142_LinkedListCycleII.java) |  Medium |  | 
| 167  | 两数之和 II - 输入有序数组 Two Sum II - Input array is sorted | [Java](leetcode/src/main/java/leetcode/__0167_TwoSumII.java)  | Easy |  |
| 234  | 回文链表 Palindrome Linked List | [Java](leetcode/src/main/java/leetcode/_0234_PalindromeLinkedList.java) | Easy |  | 
| 283  | 移动零 Move Zeroes | [Java](leetcode/src/main/java/leetcode/_0283_MoveZeroes.java) | Easy |  |
| 287  | 寻找重复数 Find the Duplicate Number | [Java](leetcode/src/main/java/leetcode/_0287_FindTheDuplicateNumber.java) |  Medium |  |

### 递归与动态规划
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
| 338  | 比特位计数 Counting Bits | [Java](leetcode/src/main/java/leetcode/_0338_CountingBits.java) | Medium |  |
| 416  | 分割等和子集 Partition Equal Subset Sum | [Java](leetcode/src/main/java/leetcode/_0416_PartitionEqualSubsetSum.java) | Medium |  | 
| 494  | 目标和 Target Sum | [Java](leetcode/src/main/java/leetcode/_0494_TargetSum.java) | Medium |  |
| 647  | 回文子串 Palindromic Substrings | [Java](leetcode/src/main/java/leetcode/_0647_PalindromicSubstrings.java) | Medium |  |

### 贪心
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  55  | 跳跃游戏 Jump Game | [Java](leetcode/src/main/java/leetcode/_0055_JumpGame.java) | Medium |  | 
| 406  | 根据身高重建队列 Queue Reconstruction by Height | [Java](leetcode/src/main/java/leetcode/_0406_QueueReconstructionByHeight.java) | Medium |  |

### 分治
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  53  | 最大子序和 Maximum Subarray | [Java](leetcode/src/main/java/leetcode/_0053_MaximumSubarray.java) | Easy |  |
| 169  | 多数元素 Majority Element | [Java](leetcode/src/main/java/leetcode/_0169_MajorityElement.java) | Easy |  | 
| 215  | 数组中的第K个最大元素 Kth Largest Element in an Array | [Java](leetcode/src/main/java/leetcode/_0215_KthLargestElementInAnArray.java) | Medium |  | 
| 240  | Search a 2D Matrix II | [Java](leetcode/src/main/java/leetcode/_0240_SearchA2DMatrixII.java) | Medium |  |

### 搜索
#### 回溯
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  17  | 电话号码的字母组合 Letter Combinations of a Phone Number | [Java](leetcode/src/main/java/leetcode/_0017_LetterCombinationsOfAPhoneNumber.java) | Medium |  |
|  22  | 括号生成 Generate Parentheses | [Java](leetcode/src/main/java/leetcode/_0022_GenerateParentheses.java) | Medium |  | 
|  39  | 组合总和 Combination Sum | [Java](leetcode/src/main/java/leetcode/_0039_CombinationSum.java) | Medium |  |
|  46  | 全排列 Permutations | [Java](leetcode/src/main/java/leetcode/_0046_Permutations.java) | Medium |  |
|  78  | 子集 Subsets | [Java](leetcode/src/main/java/leetcode/_0078_Subsets.java) | Medium |  |
|  79  | 单词搜索 Word Search | [Java](leetcode/src/main/java/leetcode/_0079_WordSearch.java) | Medium |  |

### 位运算
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|  78  | 子集 Subsets | [Java](leetcode/src/main/java/leetcode/_0078_Subsets.java) | Medium |  |
| 136  | 只出现一次的数字 Single Number  | [Java](leetcode/src/main/java/leetcode/_0136_SingleNumber.java) | Easy |  |
| 169  | 多数元素 Majority Element | [Java](leetcode/src/main/java/leetcode/_0169_MajorityElement.java) | Easy |  | 
| 338  | 比特位计数 Counting Bits | [Java](leetcode/src/main/java/leetcode/_0338_CountingBits.java) | Medium |  |
| 461  | 汉明距离 Hamming Distance | [Java](leetcode/src/main/java/leetcode/_0461_HammingDistance.java) | Easy |  |

### 滑动窗口
|  No  | Problem | Solution | Difficulty | Tag  |
|------|---------|----------|------------|------|
|   3  | 无重复字符的最长子串 Longest Substring Without Repeating Characters | [Java](leetcode/src/main/java/leetcode/_0003_LongestSubstringWithoutRepeatingCharacters.java) | Medium |  |

---

## Top 100 Liked Questions

|  No  | Problem | Solution | Difficulty | Tag |
|------|---------|----------|------------|-----|
|   1  | 两数之和 Two Sum | [Java](leetcode/src/main/java/leetcode/_0001_TwoSum.java) | Easy |  |
|   2  | Add Two Numbers | [Java](leetcode/src/main/java/leetcode/_0002_AddTwoNumbers.java) | Medium |  |
|   3  | 无重复字符的最长子串 Longest Substring Without Repeating Characters | [Java](leetcode/src/main/java/leetcode/_0003_LongestSubstringWithoutRepeatingCharacters.java) | Medium |  |
|   5  | 最长回文子串 Longest Palindromic Substring | [Java](leetcode/src/main/java/leetcode/_0005_LongestPalindromicSubstring.java) | Medium |  |
|  11  | 盛最多水的容器 Container With Most Water | [Java](leetcode/src/main/java/leetcode/_0011_ContainerWithMostWater.java) | Medium |  |
|  15  | 三数之和 3Sum | [Java](leetcode/src/main/java/leetcode/_0015_3Sum.java) | Medium |  |
|  16  | 最接近的三数之和 3Sum Closest | [Java](leetcode/src/main/java/leetcode/_0016_3SumClosest.java) | Medium |  |
|  17  | 电话号码的字母组合 Letter Combinations of a Phone Number | [Java](leetcode/src/main/java/leetcode/_0017_LetterCombinationsOfAPhoneNumber.java) | Medium |  |
|  19  | 删除链表的倒数第N个节点 Remove Nth Node From End of List | [Java](leetcode/src/main/java/leetcode/_0019_RemoveNthNodeFromEndOfList.java) | Medium |  |
|  20  | 有效的括号 Valid Parentheses | [Java](leetcode/src/main/java/leetcode/_0020_ValidParentheses.java) | Easy |  | 
|  21  | Merge Two Sorted Lists | [Java](leetcode/src/main/java/leetcode/_0021_MergeTwoSortedLists.java) | Easy |  | 
|  22  | 括号生成 Generate Parentheses | [Java](leetcode/src/main/java/leetcode/_0022_GenerateParentheses.java) | Medium |  | 
|  31  | Next Permutation | [Java](leetcode/src/main/java/leetcode/_0031_NextPermutation.java) | Medium |  |
|  34  | 在排序数组中查找元素的第一个和最后一个位置 Find First and Last Position of Element in Sorted Array | [Java](leetcode/src/main/java/leetcode/_0034_FirstAndLastPositionOfElementInSortedArray.java) | Medium |  |
|  39  | 组合总和 Combination Sum | [Java](leetcode/src/main/java/leetcode/_0039_CombinationSum.java) | Medium |  |
|  46  | 全排列 Permutations | [Java](leetcode/src/main/java/leetcode/_0046_Permutations.java) | Medium |  |
|  48  | Rotate Image | [Java](leetcode/src/main/java/leetcode/_0048_RotateImage.java) | Medium |  |
|  49  | 字母异位词分组 Group Anagrams | [Java](leetcode/src/main/java/leetcode/_0049_GroupAnagrams.java) | Medium |  |
|  53  | 最大子序和 Maximum Subarray | [Java](leetcode/src/main/java/leetcode/_0053_MaximumSubarray.java) | Easy |  |
|  55  | 跳跃游戏 Jump Game | [Java](leetcode/src/main/java/leetcode/_0055_JumpGame.java) | Medium |  | 
|  56  | 合并区间 Merge Intervals | [Java](leetcode/src/main/java/leetcode/_0056_MergeIntervals.java) | Medium |  | 
|  62  | Unique Paths | [Java](leetcode/src/main/java/leetcode/_0062_UniquePaths.java) | Medium |  |
|  62  | Minimum Path Sum | [Java](leetcode/src/main/java/leetcode/_0064_MinimumPathSum.java) | Medium | |
|  70  | Climbing Stairs | [Java](leetcode/src/main/java/leetcode/_0070_ClimbingStairs.java) | Easy |  |
|  75  | 颜色分类 Sort Colors | [Java](leetcode/src/main/java/leetcode/_0075_SortColors.java) | Medium |  |
|  78  | 子集 Subsets | [Java](leetcode/src/main/java/leetcode/_0078_Subsets.java) | Medium |  |
|  79  | 单词搜索 Word Search | [Java](leetcode/src/main/java/leetcode/_0079_WordSearch.java) | Medium |  |
|  94  | 二叉树的中序遍历 Binary Tree Inorder | [Java](leetcode/src/main/java/leetcode/_0094_BinaryTreeInorderTraversal.java)  | Medium |  |
|  96  | 不同的二叉搜索树 Unique Binary Search Trees | [Java](leetcode/src/main/java/leetcode/_0096_UniqueBinarySearchTrees.java) | Medium |  | 
|  98  | 验证二叉搜索树 Validate Binary Search Tree | [Java](leetcode/src/main/java/leetcode/_0098_ValidateBinarySearchTree.java)  | Medium |  |
| 101  | 对称二叉树 Symmetric Tree | [Java](leetcode/src/main/java/leetcode/_0101_SymmetricTree.java) | Easy |  |
| 102  | 二叉树的层次遍历 Binary Tree Level Order Traversal | [Java](leetcode/src/main/java/leetcode/_0102_BinaryTreeLevelOrderTraversal.java) |  Medium |  |
| 104  | 二叉树的最大深度 Maximum Depth of Binary Tree | [Java](leetcode/src/main/java/leetcode/_0104_MaximumDepthOfBinaryTree.java) | Easy |  |
| 105  | 从前序与中序遍历序列构造二叉树 Construct Binary Tree from Preorder and Inorder Traversal | [Java](leetcode/src/main/java/leetcode/_0105_ConstructBinaryTreeFromPreorderAndInorderTraversal.java) |  Medium |  | 
| 114  | 二叉树展开为链表 Flatten Binary Tree to Linked List | [Java](leetcode/src/main/java/leetcode/_0114_FlattenBinaryTreeToLinkedList.java) | Medium |  |  
| 121  | Best Time to Buy and Sell Stock | [Java](leetcode/src/main/java/leetcode/_0121_BestTimeToBuyAndSellSock.java) | Easy |  |  
| 124  | 二叉树中的最大路径和 Binary Tree Maximum Path Sum | [Java](leetcode/src/main/java/leetcode/_0124_BinaryTreeMaximumPathSum.java) |  Hard |  |
| 136  | 只出现一次的数字 Single Number  | [Java](leetcode/src/main/java/leetcode/_0136_SingleNumber.java) | Easy |  |
| 139  | Word Break | [Java](leetcode/src/main/java/leetcode/_0139_WordBreak.java) |  Medium |  |   
| 141  | 环形链表 Linked List Cycle | [Java](leetcode/src/main/java/leetcode/_0141_LinkedListCycle.java) |  Easy |  |   
| 142  | 环形链表 II Linked List Cycle II | [Java](leetcode/src/main/java/leetcode/_0142_LinkedListCycleII.java) |  Medium |  | 
| 146  | LRU Cache | [Java](leetcode/src/main/java/leetcode/_0146_LRUCache.java) | Medium |  |  
| 148  | 排序链表 Sort List | [Java](leetcode/src/main/java/leetcode/_0148_SortList.java) | Medium |  |  
| 152  | Maximum Product Subarray | [Java](leetcode/src/main/java/leetcode/_0152_MaximumProductSubarray.java) | Medium |  |  
| 155  | Min Stack | [Java](leetcode/src/main/java/leetcode/_0155_MinStack.java) | Easy |  | 
| 160  | Intersection of Two Linked Lists | [Java](leetcode/src/main/java/leetcode/_0160_IntersectionOfTwoLinkedLists.java) | Easy |  | 
| 169  | 多数元素 Majority Element | [Java](leetcode/src/main/java/leetcode/_0169_MajorityElement.java) | Easy |  | 
| 198  | House Robber | [Java](leetcode/src/main/java/leetcode/_0198_HouseRobber.java) | Easy |  |  
| 200  | Number of Islands | [Java](leetcode/src/main/java/leetcode/_0200_NumberOfIslands.java) | Medium |  | 
| 206  | Reverse Linked List | [Java](leetcode/src/main/java/leetcode/_0206_ReverseLinkedList.java) | Easy |  |
| 207  | 课程表 Course Schedule | [Java](leetcode/src/main/java/leetcode/_0207_CourseSchedule.java) |  Medium |  | 
| 208  | 实现 Trie (前缀树) Implement Trie (Prefix Tree) | [Java](leetcode/src/main/java/leetcode/_0208_ImplementTrie.java) | Medium |  | 
| 215  | 数组中的第K个最大元素 Kth Largest Element in an Array | [Java](leetcode/src/main/java/leetcode/_0215_KthLargestElementInAnArray.java) | Medium |  | 
| 221  | Maximal Square | [Java](leetcode/src/main/java/leetcode/_0221_MaximalSquare.java) | Medium |  | 
| 226  | 翻转二叉树 Invert Binary Tree | [Java](leetcode/src/main/java/leetcode/_0226_InvertBinaryTree.java) | Easy |  | 
| 234  | 回文链表 Palindrome Linked List | [Java](leetcode/src/main/java/leetcode/_0234_PalindromeLinkedList.java) | Easy |  | 
| 236  | 二叉树的最近公共祖先 Lowest Common Ancestor of a Binary Tree | [Java](leetcode/src/main/java/leetcode/_0236_LowestCommonAncestorOfABinaryTree.java) | Medium |  | 
| 238  | Product of Array Except Self | [Java](leetcode/src/main/java/leetcode/_0238_ProductOfArrayExceptSelf.java)  | Medium |  |
| 240  | 搜索二维矩阵 II Search a 2D Matrix II | [Java](leetcode/src/main/java/leetcode/_0240_SearchA2DMatrixII.java) | Medium |  |
| 253  | **Meeting Rooms II** | [Java](leetcode/src/main/java/leetcode/_0253_MeetingRoomsII.java) | Medium |  |
| 279  | Perfect Squares | [Java](leetcode/src/main/java/leetcode/_0279_PerfectSquares.java) | Medium |  | 
| 283  | 移动零 Move Zeroes | [Java](leetcode/src/main/java/leetcode/_0283_MoveZeroes.java) | Easy |  |
| 287  | 寻找重复数 Find the Duplicate Number | [Java](leetcode/src/main/java/leetcode/_0287_FindTheDuplicateNumber.java) |  Medium |  | 
| 300  | 最长上升子序列 Longest Increasing Subsequence | [Java](leetcode/src/main/java/leetcode/_0300_LongestIncreasingSubsequence.java) | Medium |  |  
| 309  | Best Time to Buy and Sell Stock with Cooldown | [Java](leetcode/src/main/java/leetcode/_0309_BestTimeToBuyAndSellStockWithCooldown.java) | Medium |  |  
| 322  | Coin Change | [Java](leetcode/src/main/java/leetcode/_0322_CoinChange.java) | Medium | |  
| 337  | 打家劫舍 III House Robber III | [Java](leetcode/src/main/java/leetcode/_0337_HouseRobberIII.java) | Medium | | 
| 338  | 比特位计数 Counting Bits | [Java](leetcode/src/main/java/leetcode/_0338_CountingBits.java) | Medium |  |
| 347  | 前 K 个高频元素 Top K Frequent Elements | [Java](leetcode/src/main/java/leetcode/_0347_TopKFrequentElements.java) |  Medium |  |
| 394  | Decode String | [Java](leetcode/src/main/java/leetcode/_0394_DecodeString.java) | Medium |  |  
| 399  | Evaluate Division | [Java](leetcode/src/main/java/leetcode/_0399_EvaluateDivision.java) | Medium |  | 
| 406  | 根据身高重建队列 Queue Reconstruction by Height | [Java](leetcode/src/main/java/leetcode/_0406_QueueReconstructionByHeight.java) | Medium |  | 
| 416  | 分割等和子集 Partition Equal Subset Sum | [Java](leetcode/src/main/java/leetcode/_0416_PartitionEqualSubsetSum.java) | Medium |  | 
| 437  | 路径总和 III Path Sum III | [Java](leetcode/src/main/java/leetcode/_0437_PathSumIII.java) | Easy |  | 
| 438  | 找到字符串中所有字母异位词 Find All Anagrams in a String | [Java](leetcode/src/main/java/leetcode/_0438_FindAllAnagramsInAString.java) | Medium |  |  
| 448  | Find All Numbers Disappeared in an Array | [Java](leetcode/src/main/java/leetcode/_0448_FindAllNumbersDisappearedInAnArray.java) | Easy |  |
| 461  | 汉明距离 Hamming Distance | [Java](leetcode/src/main/java/leetcode/_0461_HammingDistance.java) | Easy |  |
| 494  | 目标和 Target Sum | [Java](leetcode/src/main/java/leetcode/_0494_TargetSum.java) | Medium |  |
| 538  | 把二叉搜索树转换为累加树 Convert BST to Greater Tree | [Java](leetcode/src/main/java/leetcode/_0538_ConvertBSTToGreaterTree.java) | Easy |  | 
| 543  | 二叉树的直径 Diameter of Binary Tree | [Java](leetcode/src/main/java/leetcode/_0543_DiameterOfBinaryTree.java) | Easy | |  
| 560  | 和为K的子数组 Subarray Sum Equals K | [Java](leetcode/src/main/java/leetcode/_0560_SubarraySumEqualsK.java) | Medium |  |
| 581  | Shortest Unsorted Continuous Subarray | [Java](leetcode/src/main/java/leetcode/_581_ShortestUnsortedContinuousSubarray.java) | Easy |  |
| 617  | 合并二叉树 Merge Two Binary Trees | [Java](leetcode/src/main/java/leetcode/_0617_MergeTwoBinaryTrees.java) | Easy |  |
| 647  | 回文子串 Palindromic Substrings | [Java](leetcode/src/main/java/leetcode/_0647_PalindromicSubstrings.java) | Medium |  |

Note:

着重体的问题表示未开放。

---

## All Questions

|  No  | Problem | Solution | Difficulty | Tag |
|------|---------|----------|------------|-----|
| 167  | 两数之和 II - 输入有序数组 Two Sum II - Input array is sorted | [Java](leetcode/src/main/java/leetcode/__0167_TwoSumII.java)  | Easy |  |
| 257  | 二叉树路径 Binary Tree Paths | [Java](leetcode/src/main/java/leetcode/_0257_BinaryTreePaths.java)  | Easy |  |

---

# 剑指offer

> 
> [**剑指offerV2源码**](interview-for-offer/src/main/java/offerV2)  
>
> [剑指offer V1编程题目录](interview-for-offer/README.md)
>
> [《剑指offer V1》编程题源码](https://github.com/li-yazhou/algorithm-primer/tree/master/interview-for-offer/src/main/java/algorithm/foroffer)
> 
> [《剑指offer V1》编程题Markdown](https://github.com/li-yazhou/algorithm-primer/tree/master/interview-for-offer/md)
>
> [剑指offer V1 编程题汇总](interview-for-offer/md/剑指offer面试题汇总.md)
>

## 剑指offer V2分类

### 剑指offer 数组与哈希表
|  No    | Leetcode | Problem & Solution |  Tag  |
| ------ | ------ |------------------ | ----- |
|  003   |        | [数组中重复的数字](interview-for-offer/src/main/java/offerV2/_003_Repeat_Num_In_Array.java) | 数组 |
|  004   |        | [二维数组中的查找](interview-for-offer/src/main/java/offerV2/_004_Find_Element_In_2D_Array.java) | 数组 |
|  011   |        | [旋转数组中的最小数字](interview-for-offer/src/main/java/offerV2/_011_Min_Element_In_Rotate_Array.java) | 数组与二分查找 |
|  017   |        | [打印从 1 到最大的 n 位数](interview-for-offer/src/main/java/offerV2/_017_Print_1_To_BigInt.java) | 数组、大整数 |
|  021   |        | [调整数组顺序使奇数位于偶数前面](interview-for-offer/src/main/java/offerV2/_021_Move_Odd_Even_Num.java) | 数组、快排 |
|  039   |        | [数组中出现次数超过一半的数字](interview-for-offer/src/main/java/offerV2/_039_Half_Same_Element_In_Array.java) | 数组、多数投票问题 |
|  040   |        | [最小的 k 个数](interview-for-offer/src/main/java/offerV2/_040_Min_K_In_Array.java) | 数组、topK、大根堆 |
|  041   |        | [数据流中的中位数](interview-for-offer/src/main/java/offerV2/_041_Medain_Num_In_Stream.java) | 数组、大根堆、小根堆 |
|  041-2 |        | [字符流中第一个不重复的字符](interview-for-offer/src/main/java/offerV2/_041_First_Distinct_Char_In_Stream.java) | 字符的数组索引、队列 |
|  050   |        | [第一个只出现一次的字符](interview-for-offer/src/main/java/offerV2/_050_First_Not_Repeat_Char.java) | 数组、数组索引、哈希表、比特位集 |
|  053   |        | [数字在排序数组中出现的次数](interview-for-offer/src/main/java/offerV2/_053_Occurence_Count_In_Sorted_Array.java) | 数组、折半查找 |
|  056   |        | [数组中只出现一次的数字](interview-for-offer/src/main/java/offerV2/_056_Appear_Once_Num.java) | 位运算、数组 |
|  057   |        | [有序数组中查找和为s的两个数](interview-for-offer/src/main/java/offerV2/_057_Find_2Num_Equal_Value_In_Sorted_Array.java) | 数组、双指针 |
|  058   |        | [翻转单词顺序](interview-for-offer/src/main/java/offerV2/_058_Reverse_Words.java) | 数组、字符串  |
|  058-2 |        | [左旋转字符串](interview-for-offer/src/main/java/offerV2/_058_Rotate_String.java) | 数组、字符串 |
|  061   |        | [扑克牌的顺子](interview-for-offer/src/main/java/offerV2/_061_Poker_Seq.java) | 数组 |
|  065   |        | [构建乘积数组](interview-for-offer/src/main/java/offerV2/_066_Multiply_Array.java) | 数组 |

### 剑指offer 链表
|  No    | Problem & Solution |  Tag  |
| ------ | ------------------ | ----- |
|  006   | [从尾到头打印链表](interview-for-offer/src/main/java/offerV2/_006_Print_List_From_Tail.java) | 链表 |
|  018-1 | [在 O(1) 时间删除链表结点](interview-for-offer/src/main/java/offerV2/_018_Delete_ListNode_O1.java) | 链表 |
|  018-2 | [删除链表中重复的结点](interview-for-offer/src/main/java/offerV2/_018_Delete_Duplicate_ListNode.java) | 链表 |
|  022   | [链表中倒数第 k 个节点](interview-for-offer/src/main/java/offerV2/_022_Kth_ListNode_From_Tail.java) | 链表、双指针 |
|  023   | [链表中环的入口结点](interview-for-offer/src/main/java/offerV2/_023_Circle_List_Entrance.java) | 链表、双指针 |
|  024   | [反转链表](interview-for-offer/src/main/java/offerV2/_024_Reverse_List.java) | 链表、递归 |
|  035   | [复杂链表的复制](interview-for-offer/src/main/java/offerV2/_035_Complex_List_Copy.java) | 链表 |

### 剑指offer 二叉树
|  No    | Leetcode | Problem & Solution |  Tag  |
| ------ | ------ | ------------------ | ----- |
|  007   |        | [根据前序和中序遍历结果重建二叉树](interview-for-offer/src/main/java/offerV2/_007_Rebuild_Tree_By_PreOrder_InOrder_Seq.java) | 二叉树 |
|  008   |        | [查找二叉树指定节点的中序遍历的下一个节点](interview-for-offer/src/main/java/offerV2/_008_Inorder_Next_TreeNode.java) | 二叉树 |
|  026   |        | [树的子结构](interview-for-offer/src/main/java/offerV2/_026_Sub_Tree.java) | 二叉树、递归  |
|  027   |        | [二叉树的镜像](interview-for-offer/src/main/java/offerV2/_027_Mirror_BinTree.java) | 二叉树、递归 |
|  028   |        | [对称的二叉树](interview-for-offer/src/main/java/offerV2/_028_Symmetrical_BinTree.jaca) | 二叉树、递归 |
|  032   |        | [从上到下打印二叉树](interview-for-offer/src/main/java/offerV2/_032_BinTree_Level_Visit.java) | 二叉树、层次遍历、队列 |
|  032-2 |        | [把二叉树打印成多行](interview-for-offer/src/main/java/offerV2/_032_BinTree_Level_Visit_With_Line.java) | 二叉树、层次遍历、队列 |
|  032-3 |        | [按之字形顺序打印二叉树](interview-for-offer/src/main/java/offerV2/_032_BinTree_Level_Visit_With_Line.java) | 二叉树、层次遍历、队列、栈 |
|  033   |        | [二叉搜索树的后序遍历序列](interview-for-offer/src/main/java/offerV2/_033_Search_BinTree_PostOrder_Check.java) | 二叉搜索树、后序遍历 |
|  034   |        | [二叉树中和为某一值的路径](interview-for-offer/src/main/java/offerV2/_034_Find_Path_Sum_In_BinTree.java) | 二叉树路径、递归 |
|  036   |        | [二叉搜索树与双向链表](interview-for-offer/src/main/java/offerV2/_036_BST_To_Dual_List.java) | 二叉搜索树、双向链表 |
|  037   |        | [序列化二叉树](interview-for-offer/src/main/java/offerV2/_037_BinTree_Serialize.java) | 二叉树、递归 |
|  054   |        | [二叉搜索树的第k个结点](interview-for-offer/src/main/java/offerV2/_054_Search_Tree_Kth_Node.java) | 二叉搜索树、中序遍历 |
|  055   |        | [二叉树的深度](interview-for-offer/src/main/java/offerV2/__055_BinTree_Depth.java) | 二叉树、二叉树的遍历 |
|  055-2 |        | [平衡二叉树](interview-for-offer/src/main/java/offerV2/_055_Balance_Tree_Check.java) | 二叉树、二叉树的遍历 |
|  068   |        | [树中两个节点的最低公共祖先节点](interview-for-offer/src/main/java/offerV2/_068_Lowest_Common_Ancestor_TreeNode.java) | 二叉树、递归、树的路径 |

### 剑指offer 栈与队列
|  No    | Leetcode | Problem & Solution |  Tag  |
| ------ | ------ | ------------------ | ----- |
|  009   |        | [用两个栈实现队列](interview-for-offer/src/main/java/offerV2/_009_2Stack_As_Queue.java) | 栈与队列 |
|  059   |        | [滑动窗口的最大值](interview-for-offer/src/main/java/offerV2/_059_Max_Value_In_Slide_Window.java) | 双端队列、大根堆 |

### 剑指offer 字符串
|  No    | Problem & Solution |  Tag  |
| ------ | ------------------ | ----- |
|  005   | [替换字符串中的空格](interview-for-offer/src/main/java/offerV2/_005_Replace_Blank_Space.java) | 字符串 |
|  038   | [字符串的排列](interview-for-offer/src/main/java/offerV2/_038_Permutation_String.java) | 字符串、递归、回溯 |
|  044   | [数字序列中的某一位数字](interview-for-offer/src/main/java/offerV2/_044_Kth_Digit.java) | 字符串 |
|  045   | [把数组排成最小的数](interview-for-offer/src/main/java/offerV2/_045_Combine_Min_Num_By_Array.java) | 字符串、数组 |

### 剑指offer 位运算
|  No    | Leetcode |  Problem & Solution |  Tag  |
| ------ | ------ | ------------------ | ----- |
|  015   |        | [二进制中1的个数](interview-for-offer/src/main/java/offerV2/_015_Count_1_Num.java) | 位运算 |
|  056   |        | [数组中只出现一次的数字](interview-for-offer/src/main/java/offerV2/_056_Appear_Once_Num.java) | 位运算、数组 |

### 剑指offer 递归与动态规划
|  No    | Leetcode | Problem & Solution |  Tag  |
| ------ | ------ | ------------------ | ----- |
|  010-1 |        | [斐波那契数列](interview-for-offer/src/main/java/offerV2/_010_Fibonacci_Seq.java) | 递归与动态规划 |
|  010-2 |        | [矩形覆盖](interview-for-offer/src/main/java/offerV2/_010_Rectangle_Coverage.java) | 递归与动态规划 |
|  010-3 |        | [跳台阶](interview-for-offer/src/main/java/offerV2/_010_Jump_Step.java) | 递归与动态规划 |
|  010-4 |        | [变态跳台阶](interview-for-offer/src/main/java/offerV2/_010_Random_Jump_Step.java) | 递归与动态规划 |
|  012   |        | [矩阵中的路径](interview-for-offer/src/main/java/offerV2/_012_Path_In_Matrix.java)| 递归、回溯、DFS |
|  013   |        | [机器人的运动范围](interview-for-offer/src/main/java/offerV2/_013_Robot_Move_Range.java) | 递归、回溯、DFS |
|  016   |        | [数值的整数次方](interview-for-offer/src/main/java/offerV2/_016_N_Power.java) | 递归 |
|  049   |        | [第 N 个丑数](interview-for-offer/src/main/java/offerV2/_049_Kth_Ugly_Num.java) | 动态规划 |
|  062   |        | [圆圈中最后剩下的数字](interview-for-offer/src/main/java/offerV2/_062_Joseph_Circle.java) | 递归 |
|  063   |        | [股票的最大利润](interview-for-offer/src/main/java/offerV2/_063_Max_Profit_Stock.java) | 动态规划、贪心 |
|  064   |        | [求前N个正整数之和](interview-for-offer/src/main/java/offerV2/_064_N_Num_Sum.java) | 递归 |

---

## 剑指offer V2
|  No    | Leetcode | Problem & Solution |  Tag  |
| ------ | ------ | ------------------ | ----- |
|  003   |        | [数组中重复的数字](interview-for-offer/src/main/java/offerV2/_003_Repeat_Num_In_Array.java) | 数组 |
|  004   |        | [二维数组中的查找](interview-for-offer/src/main/java/offerV2/_004_Find_Element_In_2D_Array.java) | 数组 |
|  005   |        | [替换字符串中的空格](interview-for-offer/src/main/java/offerV2/_005_Replace_Blank_Space.java) | 字符串 |
|  006   |        | [从尾到头打印链表](interview-for-offer/src/main/java/offerV2/_006_Print_List_From_Tail.java) | 链表 |
|  007   |        | [根据前序和中序遍历结果重建二叉树](interview-for-offer/src/main/java/offerV2/_007_Rebuild_Tree_By_PreOrder_InOrder_Seq.java) | 二叉树 |
|  008   |        | [查找二叉树指定节点的中序遍历的下一个节点](interview-for-offer/src/main/java/offerV2/_008_Inorder_Next_TreeNode.java) | 二叉树 |
|  009   |        | [用两个栈实现队列](interview-for-offer/src/main/java/offerV2/_009_2Stack_As_Queue.java) | 栈与队列 |
|  010-1 |        | [斐波那契数列](interview-for-offer/src/main/java/offerV2/_010_Fibonacci_Seq.java) | 递归与动态规划 |
|  010-2 |        | [矩形覆盖](interview-for-offer/src/main/java/offerV2/_010_Rectangle_Coverage.java) | 递归与动态规划 |
|  010-3 |        | [跳台阶](interview-for-offer/src/main/java/offerV2/_010_Jump_Step.java) | 递归与动态规划 |
|  010-4 |        | [变态跳台阶](interview-for-offer/src/main/java/offerV2/_010_Random_Jump_Step.java) | 递归与动态规划 |
|  011   |        | [旋转数组中的最小数字](interview-for-offer/src/main/java/offerV2/_011_Min_Element_In_Rotate_Array.java) | 数组与二分查找 |
|  012   |        | [矩阵中的路径](interview-for-offer/src/main/java/offerV2/_012_Path_In_Matrix.java)| 递归、回溯、DFS |
|  013   |        | [机器人的运动范围](interview-for-offer/src/main/java/offerV2/_013_Robot_Move_Range.java) | 递归、回溯、DFS |
|  014   |        | 剪绳子使各段长度的乘积最大 | 贪心、动态规划 |
|  015   |        | [二进制中1的个数](interview-for-offer/src/main/java/offerV2/_015_Count_1_Num.java) | 位运算 |
|  016   |        | [数值的整数次方](interview-for-offer/src/main/java/offerV2/_016_N_Power.java) | 递归、折半 |
|  017   |        | [打印从 1 到最大的 n 位数](interview-for-offer/src/main/java/offerV2/_017_Print_1_To_BigInt.java) | 数组、大整数 |
|  018-1 |        | [在 O(1) 时间删除链表结点](interview-for-offer/src/main/java/offerV2/_018_Delete_ListNode_O1.java) | 链表 |
|  018-2 |        | [删除链表中重复的结点](interview-for-offer/src/main/java/offerV2/_018_Delete_Duplicate_ListNode.java) | 链表 |
|  019   |        | 正则表达式 | 动态规划 |
|  020   |        | 表示数值的字符串 | 字符串、正则表达式 |
|  021   |        | [调整数组顺序使奇数位于偶数前面](interview-for-offer/src/main/java/offerV2/_021_Move_Odd_Even_Num.java) | 数组、快排 |
|  022   |        | [链表中倒数第 k 个节点](interview-for-offer/src/main/java/offerV2/_022_Kth_ListNode_From_Tail.java) | 链表、双指针 |
|  023   |        | [链表中环的入口结点](interview-for-offer/src/main/java/offerV2/_023_Circle_List_Entrance.java) | 链表、双指针 |
|  024   |        | [反转链表](interview-for-offer/src/main/java/offerV2/_024_Reverse_List.java) | 链表、递归 |
|  026   |        | [树的子结构](interview-for-offer/src/main/java/offerV2/_026_Sub_Tree.java) | 二叉树、递归  |
|  027   |        | [二叉树的镜像](interview-for-offer/src/main/java/offerV2/_027_Mirror_BinTree.java) | 二叉树、递归 |
|  028   |        | [对称的二叉树](interview-for-offer/src/main/java/offerV2/_028_Symmetrical_BinTree.jaca) | 二叉树、递归 |
|  029   |        | 顺时针打印矩阵 | 数组 |
|  030   |        | [包含 min 函数的栈](interview-for-offer/src/main/java/offerV2/_030_Stack_With_Min_Value.java) | 栈 |
|  031   |        | [栈的压入、弹出序列](interview-for-offer/src/main/java/offerV2/_031_Validate_Stack_Pop_Seq.java) | 栈 |
|  032   |        | [从上到下打印二叉树](interview-for-offer/src/main/java/offerV2/_032_BinTree_Level_Visit.java) | 二叉树、层次遍历、队列 |
|  032-2 |        | [把二叉树打印成多行](interview-for-offer/src/main/java/offerV2/_032_BinTree_Level_Visit_With_Line.java) | 二叉树、层次遍历、队列 |
|  032-3 |        | [按之字形顺序打印二叉树](interview-for-offer/src/main/java/offerV2/_032_BinTree_Level_Visit_With_Line.java) | 二叉树、层次遍历、队列、栈 |
|  033   |        | [二叉搜索树的后序遍历序列](interview-for-offer/src/main/java/offerV2/_033_Search_BinTree_PostOrder_Check.java) | 二叉搜索树、后序遍历 |
|  034   |        | [二叉树中和为某一值的路径](interview-for-offer/src/main/java/offerV2/_034_Find_Path_Sum_In_BinTree.java) | 二叉树路径、递归 |
|  035   |        | [复杂链表的复制](interview-for-offer/src/main/java/offerV2/_035_Complex_List_Copy.java) | 链表 |
|  036   |        | [二叉搜索树与双向链表](interview-for-offer/src/main/java/offerV2/_036_BST_To_Dual_List.java) | 二叉搜索树、双向链表 |
|  037   |        | [序列化二叉树](interview-for-offer/src/main/java/offerV2/_037_BinTree_Serialize.java) | 二叉树、递归 |
|  038   |        | [字符串的排列](interview-for-offer/src/main/java/offerV2/_038_Permutation_String.java) | 字符串、递归、回溯 |
|  039   |        | [数组中出现次数超过一半的数字](interview-for-offer/src/main/java/offerV2/_039_Half_Same_Element_In_Array.java) | 数组、多数投票问题 |
|  040   |        | [最小的 k 个数](interview-for-offer/src/main/java/offerV2/_040_Min_K_In_Array.java) | 数组、topK、大根堆 |
|  041   |        | [数据流中的中位数](interview-for-offer/src/main/java/offerV2/_041_Medain_Num_In_Stream.java) | 数组、大根堆、小根堆 |
|  041-2 |        | [字符流中第一个不重复的字符](interview-for-offer/src/main/java/offerV2/_041_First_Distinct_Char_In_Stream.java) | 字符的数组索引、队列 |
|  042   |        | [连续子数组的最大和](interview-for-offer/src/main/java/offerV2/_043_Subseq_Max_Sum.java) | 数组、动态规划 |
|  043   |        | 从 1 到 n 整数中 1 出现的次数 |  |
|  044   |        | [数字序列中的某一位数字](interview-for-offer/src/main/java/offerV2/_044_Kth_Digit.java) | 字符串 |
|  045   |        | [把数组排成最小的数](interview-for-offer/src/main/java/offerV2/_045_Combine_Min_Num_By_Array.java) | 字符串、数组 |
|  046   |        | 把数字翻译成字符串 | 动态规划 |
|  047   |        | 礼物的最大价值 | 动态规划 |
|  048   |        | 最长不含重复字符的子字符串 |  |
|  049   |        | [第 N 个丑数](interview-for-offer/src/main/java/offerV2/_049_Kth_Ugly_Num.java) | 动态规划 |
|  050   |        | [第一个只出现一次的字符](interview-for-offer/src/main/java/offerV2/_050_First_Not_Repeat_Char.java) | 数组、数组索引、哈希表、比特位集 |
|  051   |        | 数组中的逆序对 | 数组、排序 |
|  052   |        | [两个链表的第一个公共结点](interview-for-offer/src/main/java/offerV2/_052_First_Common_ListNode.java) | 链表、双指针 |
|  053   |        | [数字在排序数组中出现的次数](interview-for-offer/src/main/java/offerV2/_053_Occurence_Count_In_Sorted_Array.java) | 数组、折半查找 |
|  054   |        | [二叉搜索树的第k个结点](interview-for-offer/src/main/java/offerV2/_054_Search_Tree_Kth_Node.java) | 二叉搜索树、中序遍历 |
|  055   |        | [二叉树的深度](interview-for-offer/src/main/java/offerV2/__055_BinTree_Depth.java) | 二叉树、二叉树的遍历 |
|  055-2 |        | [平衡二叉树](interview-for-offer/src/main/java/offerV2/_055_Balance_Tree_Check.java) | 二叉树、二叉树的遍历 |
|  056   |        | [数组中只出现一次的数字](interview-for-offer/src/main/java/offerV2/_056_Appear_Once_Num.java) | 位运算、数组 |
|  057   |        | [有序数组中查找和为s的两个数](interview-for-offer/src/main/java/offerV2/_057_Find_2Num_Equal_Value_In_Sorted_Array.java) | 数组、双指针 |
|  057-2 |        | [为 s 的连续正数序列](interview-for-offer/src/main/java/offerV2/_057_Find_Seq_Sum_Equal_Value.java) | 数组、双指针 |
|  058   |        | [翻转单词顺序](interview-for-offer/src/main/java/offerV2/_058_Reverse_Words.java) | 数组、字符串 |
|  058-2 |        | [左旋转字符串](interview-for-offer/src/main/java/offerV2/_058_Rotate_String.java) | 数组、字符串 |
|  059   |        | [滑动窗口的最大值](interview-for-offer/src/main/java/offerV2/_059_Max_Value_In_Slide_Window.java) | 双端队列、大根堆 |
|  060   |        | n 个骰子的点数 |  |
|  061   |        | [扑克牌的顺子](interview-for-offer/src/main/java/offerV2/_061_Poker_Seq.java) | 数组 |
|  062   |        | [圆圈中最后剩下的数字](interview-for-offer/src/main/java/offerV2/_062_Joseph_Circle.java) | 递归 |
|  063   |        | [股票的最大利润](interview-for-offer/src/main/java/offerV2/_063_Max_Profit_Stock.java) | 动态规划、贪心 |
|  064   |        | [求前N个正整数之和](interview-for-offer/src/main/java/offerV2/_064_N_Num_Sum.java) | 递归 |
|  065   |        | 不用加减乘除做加法 | 位运算、递归 |
|  066   |        | [构建乘积数组](interview-for-offer/src/main/java/offerV2/_066_Multiply_Array.java) | 数组 |
|  067   |        | [把字符串转换成整数](interview-for-offer/src/main/java/offerV2/_067_Cast_String_To_Int.java) | 字符串 |
|  068   |        | [树中两个节点的最低公共祖先节点](interview-for-offer/src/main/java/offerV2/_068_Lowest_Common_Ancestor_TreeNode.java) | 二叉树、递归、树的路径 |

---

## 剑指offer V1

|  No  | Problem & Solution |
| --- | --- |
|  2  | [实现单例模式](interview-for-offer/md/002-单例模式.md) |
|  3  | [二维数组中的查找](interview-for-offer/md/003-二维数组中的查找.md) |
|  4  | [替换空格](interview-for-offer/md/004-替换空格.md) |
|  5  | [从尾到头打印链表](interview-for-offer/md/005-从头到尾打印链表.md) |
|  6  | [重建二叉树2](interview-for-offer/md/006-重建二叉树.md) |
|  7  | [用两个栈实现队列](interview-for-offer/md/007-用两个栈实现队列.md) |
|  8  | [旋转数组的最小数字](interview-for-offer/md/008-旋转数组的最小数字.md) |
|  9  | [斐波那契数列/青蛙跳台阶/矩形覆盖/变态跳台阶](interview-for-offer/md/009-斐波那契数列-青蛙跳台阶-矩形覆盖-变态跳台阶.md) |
|  10 | [二进制中 1 的个数](interview-for-offer/md/010-二进制中1的个数.md) |
|  11 | [数值的整数次方](interview-for-offer/md/011-数值的整数次方.md) |
|  12 | [打印 1 到最大的 n 位整数](interview-for-offer/md/012-打印1到最大的n位整数.md) |
|  13 | [在 o(1) 时间删除链表结点](interview-for-offer/md/013-在o(1)时间删除链表结点.md)  |
|  14 | [调整数组顺序使奇数位于偶数前面](interview-for-offer/md/014-调整数组顺序使奇数位于偶数前面.md) |
|  15 | [链表中倒数第 k 个节点](interview-for-offer/md/015-链表中倒数第k个结点.md) |
|  16 | [反转链表](interview-for-offer/md/016-反转链表.md) |
|  17 | [合并两个排序的链表](interview-for-offer/md/017-合并两个排序的链表.md) |
|  18 | [树的子结构](interview-for-offer/md/018-树的子结构.md) |
|  19 | [二叉树的镜像](interview-for-offer/md/019-二叉树的镜像.md) |
|  20 | [顺时针打印矩阵](interview-for-offer/md/020-顺时针打印矩阵.md) |
|  21 | [包含 min 函数的栈](interview-for-offer/md/021-包含min函数的栈.md) |
|  22 | [栈的压入、弹出序列](interview-for-offer/md/022-栈的压入和弹出序列.md) |
|  23 | [从上到下打印二叉树](interview-for-offer/md/023-从上到下打印二叉树.md) |
|  24 | [二叉搜索树的后序遍历序列](interview-for-offer/md/024-二叉搜索树的后序遍历序列.md) |
|  25 | [二叉树中和为某一值的路径](interview-for-offer/md/025-二叉树中和为某一值的路径.md) |
|  26 | [复杂链表的复制](interview-for-offer/md/026-复杂链表的复制.md) |
|  27 | [二叉搜索树与双向链表](interview-for-offer/md/027-二叉搜索树与双向链表.md) |
|  28 | [字符串的排列](interview-for-offer/md/028-字符串的排列.md) |
|  29 | [数组中出现次数超过一半的数字](interview-for-offer/md/029-数组中出现次数超过一半的数字.md) |
|  30 | [最小的 k 个数](interview-for-offer/md/030-最小的k个数.md) |
|  31 | [连续子数组的最大和](interview-for-offer/md/031-连续子数组的最大和.md) |
|  32 | [从 1 到 n 整数中 1 出现的次数](interview-for-offer/md/032-从1到n整数中1出现的次数.md) |
|  33 | [把数组排成最小的数](interview-for-offer/md/033-把数组排成最小的数.md) |
|  34 | [丑数](interview-for-offer/md/034-丑数.md) |
|  35 | [第一个只出现一次的字符](interview-for-offer/md/035-第一个只出现一次的字符.md) |
|  36 | [数组中的逆数对](interview-for-offer/md/036-数组中的逆数对.md) |
|  37 | [两个链表的第一个公共结点](interview-for-offer/md/037-两个链表的第一个公共结点.md) |
|  38 | [数字在排序数组中出现的次数](interview-for-offer/md/038-数字在排序数组中出现的次数.md) |
|  39 | [二叉树的深度](interview-for-offer/md/039-二叉树的深度.md) |
|  40 | [数组中只出现一次的数字](interview-for-offer/md/040-数组中只出现一次的数字.md) |
|  41 | [和为 s 的两个数字 VS 和为 s 的连续正数序列](interview-for-offer/md/041-和为s的两个数字VS和为s的连续正数序列.md) |
|  42 | [翻转单词顺序 VS 左旋转字符串](interview-for-offer/md/042-翻转单词顺序VS左旋转字符串.md) |
|  43 | [n 个骰子的点数]() |
|  44 | [扑克牌的顺子](interview-for-offer/md/044-扑克牌的顺子.md) |
|  45 | [圆圈中最后剩下的数字](interview-for-offer/md/045-圆圈中最后剩下的数字.md) |
|  46 | [求前 n 项正整数的和（不能使用乘除法以及for、while、if 等关键字）](interview-for-offer/md/046-不使用乘除与判断求前N项正整数的和.md) |
|  47 | [不用加减乘除做加法](interview-for-offer/md/047-不用加减乘除做加法.md) |
|  48 | [不能被继承的类](interview-for-offer/md/048-不能被继承的类.md) |
|  49 | [把字符串转换成整数](interview-for-offer/md/049-把字符串转换成整数.md) |
|  50 | [树中两个结点的最低公共祖先结点](interview-for-offer/md/050-树中两个结点的最低公共祖先结点.md) |
|  51 | [数组中重复的数字](interview-for-offer/md/051-数组中重复的数字.md) |
|  52 | [构建乘积数组](interview-for-offer/md/052-构建乘积数组.md) |
|  55 | [字符流中第一个不重复的字符](interview-for-offer/md/055-字符流中第一个不重复的字符.md) |
|  56 | [链表中环的入口结点](interview-for-offer/md/056-链表中环的入口结点.md) |
|  57 | [删除链表中重复的结点](interview-for-offer/md/057-删除链表中重复的结点.md) |
|  58 | [二叉树的下一个结点](interview-for-offer/md/058-二叉树的下一个结点.md) |
|  59 | [对称的二叉树](interview-for-offer/md/059-对称的二叉树.md) |
|  60 | [把二叉树打印成多行](interview-for-offer/md/060-把二叉树打印成多行.md) |
|  61 | [按之字形顺序打印二叉树](interview-for-offer/md/061-按之字形顺序打印二叉树.md) |
|  62 | [序列化二叉树](interview-for-offer/md/062-序列化和反序列化二叉树.md) |
|  63 | [二叉搜索树的第k个结点](interview-for-offer/md/063-二叉搜索树的第k个结点.md) |
|  64 | [数据流中的中位数](interview-for-offer/md/064-数据流中的中位数.md) |
|  65 | [滑动窗口的最大值](interview-for-offer/md/065-滑动窗口的最大值.md) |

---

# 参考
* [leetcode overview](https://leetcode.com/problemset/all/)
* 《程序员代码面试指南 第2版》
* 《剑指offer 第2版》
* 《编程之美》
* 《编程珠玑》
* 《算法 第4版》
* 《算法导论 第3版》

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