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:coffee: 2019校招代码面试记录，Leetcode/牛客网/剑指Offer/名企笔试

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# Interview Code

2019校招面试代码记录，from leetcode、newcoder...

## 题目来源

- Leetcode
- Newcoder
- 国内大厂面试笔试题
  - 阿里巴巴
  - 腾讯
  - 网易
  - ...
- 经典算法与数据结构

## Github

[frank-lam/interview_code: 2019校招面试代码记录](https://github.com/frank-lam/interview_code)

[玩转数据结构](https://github.com/liuyubobobo/Play-with-Data-Structures)

[玩转算法面试](https://github.com/liuyubobobo/Play-with-Algorithm-Interview)

[算法与数据结构](https://github.com/liuyubobobo/Play-with-Algorithms)

## 学习日志

- 2018/07/02：Leetcode完成`349`、`350`，参考[玩转数据结构-第七章]学习`set`和`map`两种底层数据结构实现
- 2018/07/03：...
- 2018/07/04：Leetcode完成`347 前K个高频元素`，学习优先队列和堆相关知识
- 2018/07/05：完成线段树相关问题
- 2018/07/06：Leetcode完成`字段数Trie`相关习题
- 2018/07/07：Leetcode完成`204素数`、`405 16进制转换问题`、`415 字符串相加10进制`、`67 字符串相加2进制`相关习题，学习并查集数据结构

| Leetcode                                                     | 类型           | 难度 | 完成时间 |
| ------------------------------------------------------------ | -------------- | ---- | -------- |
| [7. 反转整数](https://leetcode-cn.com/problems/reverse-integer/description/) |                | 简单 | 7/10     |
| [1. 两数之和](https://leetcode-cn.com/problems/two-sum/description/) |                | 简单 | 7/11     |
| [292. Nim游戏](https://leetcode-cn.com/problems/nim-game/description/) |                | 简单 | 7/11     |
| [169 求众数](https://leetcode-cn.com/problems/majority-element/description/) |                | 简单 | 7/11     |
|                                                              |                |      |          |
|                                                              |                |      |          |
| [746. 使用最小花费爬楼梯](https://leetcode-cn.com/problems/min-cost-climbing-stairs/description/) |                | 简单 |          |
|                                                              |                |      |          |
|                                                              |                |      |          |
| **第8章：递归和回溯法**                                      |                |      |          |
| [17. 电话号码的字母组合](https://leetcode-cn.com/problems/letter-combinations-of-a-phone-number/description/) ★ | 递归和回溯     | 中等 | 7/15     |
| 93 ip地址                                                    | 递归和回溯     |      |          |
| 131 子串 回文串                                              | 递归和回溯     |      |          |
| [46. 全排列](https://leetcode-cn.com/problems/permutations/description/) ★ | 递归和回溯     | 中等 | 7/15     |
| 47. 全排列2（有相同元素）                                    | 递归和回溯     |      |          |
| [77. 组合](https://leetcode-cn.com/problems/combinations/description/) ★ | 递归和回溯     | 中等 | 7/15     |
| 39 集合sum1                                                  | 递归和回溯     |      |          |
| 40 集合sum2                                                  | 递归和回溯     |      |          |
| 216 集合sum3                                                 | 递归和回溯     |      |          |
| 78 subsets                                                   | 递归和回溯     |      |          |
| 90 subsets2                                                  | 递归和回溯     |      |          |
| 401 Binary Watch                                             | 递归和回溯     |      |          |
| [79. 单词搜索](https://leetcode-cn.com/problems/word-search/description/) ★ | 二维平面回溯   | 中等 | 8/17     |
| [200. 岛屿的个数](https://leetcode-cn.com/problems/number-of-islands/description/) ★ | floodfill算法  |      |          |
| 130. Surrounded Regions ★                                    | floodfill算法  |      |          |
| [417. Pacific Atlantic Water Flow](https://leetcode-cn.com/problems/pacific-atlantic-water-flow) | 二维平面回溯   |      |          |
| [51. N皇后](https://leetcode-cn.com/problems/n-queens/description/) ★ | 二维平面回溯   |      |          |
| 52. N皇后2                                                   |                |      |          |
| 37. 数独问题                                                 |                |      |          |
|                                                              |                |      |          |
| **第9章：动态规划**                                          |                |      |          |
| [70. 爬楼梯](https://leetcode-cn.com/problems/climbing-stairs/description/) ★ | 动态规划       | 简单 | 7/12     |
| 120 Triangle                                                 |                |      |          |
| 64 min path sum                                              |                |      |          |
| [343  整数拆分 ](https://leetcode-cn.com/problems/integer-break/description/) ★ | 动态规划       | 简单 | 7/13     |
| 279 Perfect Squares                                          |                |      |          |
| 91 Decode Ways                                               |                |      |          |
| 62 Unique Paths                                              |                |      |          |
| 63 Unique Paths2                                             |                |      |          |
| [198. 打家劫舍](https://leetcode-cn.com/problems/house-robber/description/) | 动态规划       | 简单 | 7/12     |
| [213. 打家劫舍 II](https://leetcode-cn.com/problems/house-robber-ii/description/) | 动态规划       | 中等 | 7/13     |
| 337 house robber3                                            |                |      |          |
| [309. 最佳买卖股票时机含冷冻期](https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-with-cooldown/description/) |                | 中等 |          |
| 416. Partition Equal Subset Sum ★                            | 背包问题       |      |          |
| 322. Coin Change                                             |                |      |          |
| 377. Combination Sum IV                                      |                |      |          |
| 474. Ones and Zeroes                                         |                |      |          |
| 139. Word Break                                              |                |      |          |
| 494. Target Sum                                              |                |      |          |
| [300. 最长上升子序列](https://leetcode-cn.com/problems/longest-increasing-subsequence/description/) ★ | 最长上升子序列 | 中等 |          |
| 376. Wiggle Subsequence                                      | 最长上升子序列 |      |          |
|                                                              |                |      |          |
| **第10章：贪心算法**                                         |                |      |          |
| [455. 分发饼干](https://leetcode-cn.com/problems/assign-cookies/description/) ★ | 贪心算法       | 简单 | 8/4      |
| [392. 判断子序列](https://leetcode-cn.com/problems/is-subsequence/description/) | 贪心算法       | 中等 | 8/4      |
| 435. Non-overlapping Intervals ★                             |                |      |          |
|                                                              |                |      |          |

## 知识框架

- 算法思想
  - 贪心思想
  - 双指针
  - 排序
    - 快速选择
    - 堆排序
    - 桶排序
    - 荷兰国旗问题
  - 二分查找
  - 搜索
    - BFS
    - DFS
    - Backtracking
  - 分治
  - 动态规划
    - 斐波那契数列
    - 矩阵路径
    - 数组区间
    - 分割整数
    - 最长递增子序列
    - 最长公共子序列
    - 0-1 背包
    - 股票交易
    - 字符串编辑
  - 数学
    - 素数
    - 最大公约数
    - 进制转换
    - 阶乘
    - 字符串加法减法
    - 相遇问题
    - 多数投票问题
    - 其它
- 数据结构相关
  - 栈和队列
  - 哈希表
  - 字符串
  - 数组与矩阵
  - 链表
  - 树
    - 递归
    - 层次遍历
    - 前中后序遍历
    - BST
    - Trie
  - 图
    - 二分图
    - 拓扑排序
    - 并查集
  - 位运算
- 参考资料

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