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# SOLVING 200 LEETCODE QUESTIONS

Welcome to Solving 200 Leetcode Questions channel.

### Please don't forget to give this repo a Star :star:

## Join our discord community to get daily LeetCode challenges - [Click Here to join](https://discord.gg/TtMT4AW)

## How to Contribute? [Click Here To Learn](https://youtu.be/k5D37W6h56o)

**What is this channel about?**

This is a study group which will serve the purpose of building an open source community which codes and prepare for job interviews together. The aim is not to become a competitive programmer. Go ahead and add your friends or siblings.

**Which programming language to pick?**

Any programming language with OOPs is acceptable. But Java/Python3 is recommended. CPP is also a good choice because it is fast when compared to any other programming language.

**Why Java/Python3?**

Because later on we might build the projects. Java and Python3 have some of the best Frameworks that you can use to build any production level application.

**What do you need to become a member of this group?**

You just have to be disciplined and punctual to become a member of this group. You will be removed from the group in case of any misconduct or indiscipline is observed.

**How much hours per day should you dedicate for this?**

Three Hours per day dedication. It all depends on your speed of learning.

**When are we starting?**

Starting 10th August, 2020 you will receive daily tasks. Till that time create a Leetcode account and start practicing the basics in your favourite programming language.

**What to learn before we receive the daily task?**

In any programming language of your choice, you should be comfortable with:
Variables, Data types(int, float, char, string, etc), Operators(arithmetic, comparison, bitwise, etc), Control Statements(if-else, for and while loop, break and continue)
Apart from this:
For Java -> Collections
For CPP -> STL

All the best!

:warning:  WARNINGS:

1. The path ahead is going to be bumpy and difficult. Join at your own risk.
    2. Dedicate at-least 3 hours per day. Sundays will be off. Over doing something is also dangerous.
    3. We will be coding for at-least 2 months daily to see some improvements.

| Day | Problem Number | Problem Name | Available Solutions | Topic |
| :---: | :---: | :---: | :---: | :---: |
| Day 1 | LeetCode 1480 | [Running Sum of 1d Array](https://leetcode.com/problems/running-sum-of-1d-array/) | `python3` `cpp` `java` | Array and Maths |
| Day 1 | LeetCode 1470 | [Shuffle the Array](https://leetcode.com/problems/shuffle-the-array/) | `python3` `cpp` `java` | Array and Maths |
| Day 1 | LeetCode 1431 | [Kids With the Greatest Number of Candies](https://leetcode.com/problems/kids-with-the-greatest-number-of-candies/) | `python3` `cpp` `java` | Array and Maths |
| Day 2 | LeetCode 1108 | [Defanging an IP Address](https://leetcode.com/problems/defanging-an-ip-address/) | `python3` `cpp` `java` | Array and Maths |
| Day 2 | LeetCode 1295 | [Find Numbers with Even Number of Digits](https://leetcode.com/problems/find-numbers-with-even-number-of-digits/) | `python3` `cpp` `java` | Array and Maths |
| Day 2 | LeetCode 1512 | [Number of Good Pairs](https://leetcode.com/problems/number-of-good-pairs/) | `python3` `cpp` `java` | Array and Maths |
| Day 3 | LeetCode 1365 | [How Many Numbers Are Smaller Than the Current Number](https://leetcode.com/problems/how-many-numbers-are-smaller-than-the-current-number/) | `python3` `cpp` `java` | Array and Maths |
| Day 3 | LeetCode 1281 | [Subtract the Product and Sum of Digits of an Integer](https://leetcode.com/problems/subtract-the-product-and-sum-of-digits-of-an-integer/) | `python3` `cpp` `java` | Array and Maths |
| Day 3 | LeetCode 1486 | [XOR Operation in an Array](https://leetcode.com/problems/xor-operation-in-an-array/) | `python3` `cpp` `java` | Array and Maths |
| Day 4 | LeetCode 1464 | [Maximum Product of Two Elements in an Array](https://leetcode.com/problems/maximum-product-of-two-elements-in-an-array/) | `python3` `cpp` `java` | Array and Maths |
| Day 4 | LeetCode 1395 | [Count Number of Teams](https://leetcode.com/problems/count-number-of-teams/) | `python3` `cpp` `java` | Array and Maths |
| Day 4 | LeetCode 1450 | [Number of Students Doing Homework at a Given Time](https://leetcode.com/problems/number-of-students-doing-homework-at-a-given-time/) | `python3` `cpp` `java` | Array and Maths |
| Day 5 | LeetCode 1342 | [Number of Steps to Reduce a Number to Zero](https://leetcode.com/problems/number-of-steps-to-reduce-a-number-to-zero/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 5 | LeetCode 338 | [Counting Bits](https://leetcode.com/problems/counting-bits/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 5 | LeetCode 136 | [Single Number](https://leetcode.com/problems/single-number/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 6 | LeetCode 1356 | [Sort Integers by The Number of 1 Bits](https://leetcode.com/problems/sort-integers-by-the-number-of-1-bits/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 6 | LeetCode 260 | [Single Number III](https://leetcode.com/problems/single-number-iii/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 6 | LeetCode 78 | [Subsets](https://leetcode.com/problems/subsets/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 7 | LeetCode 389 | [Find the Difference](https://leetcode.com/problems/find-the-difference/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 7 | LeetCode 461 | [Hamming Distance](https://leetcode.com/problems/hamming-distance/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 7 | LeetCode 137 | [Single Number II](https://leetcode.com/problems/single-number-ii/) | `python3` `cpp` `java` | Bit Manipulation |
| Day 8 | LeetCode 268 | [Missing Number](https://leetcode.com/problems/missing-number/) | `python3` `cpp` `java` | Array and Maths |
| Day 8 | LeetCode 42 | [Trapping Rain Water](https://leetcode.com/problems/trapping-rain-water/) | `python3` `cpp` `java` | Array and Maths |
| Day 8 | LeetCode 53 | [Maximum Subarray](https://leetcode.com/problems/maximum-subarray/) | `python3` `cpp` `java` | Array and Maths |
| Day 9 | LeetCode 287 | [Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number/) | `python3` `cpp` `java` | Array and Maths |
| Day 9 | LeetCode 1200 | [Minimum Absolute Difference](https://leetcode.com/problems/minimum-absolute-difference/) | `python3` `cpp` `java` | Array and Maths |
| Day 9 | LeetCode 304 | [Range Sum Query 2D - Immutable](https://leetcode.com/problems/range-sum-query-2d-immutable/) | `python3` `cpp` `java` | Array and Maths |
| Day 10 | LeetCode 1351 | [Count Negative Numbers in a Sorted Matrix](https://leetcode.com/problems/count-negative-numbers-in-a-sorted-matrix/) | `python3` `cpp` `java` | Binary Search |
| Day 10 | LeetCode 34 | [Find First and Last Position of Element in Sorted Array](https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/) | `python3` `cpp` `java` | Binary Search |
| Day 10 | LeetCode 69 | [Sqrt(x)](https://leetcode.com/problems/sqrtx/) | `python3` `cpp` `java` | Binary Search |
| Day 11 | LeetCode 162 | [Find Peak Element](https://leetcode.com/problems/find-peak-element/) | `python3` `cpp` `java` | Binary Search |
| Day 11 | LeetCode 153 | [Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/) | `python3` `cpp` `java` | Binary Search |
| Day 11 | LeetCode 33 | [Search in Rotated Sorted Array](https://leetcode.com/problems/search-in-rotated-sorted-array/) | `python3` `cpp` `java` | Binary Search |
| Day 12 | LeetCode 977 | [Squares of a Sorted Array](https://leetcode.com/problems/squares-of-a-sorted-array/) | `python3` `cpp` `java` | Two Pointers |
| Day 12 | LeetCode 763 | [Partition Labels](https://leetcode.com/problems/partition-labels/) | `python3` `cpp` `java` | Two Pointers |
| Day 12 | LeetCode 344 | [Reverse String](https://leetcode.com/problems/reverse-string/) | `python3` `cpp` `java` | Two Pointers |
| Day 13 | LeetCode 1528 | [Shuffle String](https://leetcode.com/problems/shuffle-string/) | `python3` `cpp` `java` | Sorting |
| Day 13 | LeetCode 1561 | [Maximum Number of Coins You Can Get](https://leetcode.com/problems/maximum-number-of-coins-you-can-get/) | `python3` `cpp` `java` | Sorting |
| Day 13 | LeetCode 1329 | [Sort the Matrix Diagonally](https://leetcode.com/problems/sort-the-matrix-diagonally/) | `python3` `cpp` `java` | Sorting |
| Day 14 | LeetCode 1502 | [Can Make Arithmetic Progression From Sequence](https://leetcode.com/problems/can-make-arithmetic-progression-from-sequence/) | `python3` `cpp` `java` | Sorting |
| Day 14 | LeetCode 1387 | [Sort Integers by The Power Value](https://leetcode.com/problems/sort-integers-by-the-power-value/) | `python3` `cpp` `java` | Sorting |
| Day 14 | LeetCode 1122 | [Relative Sort Array](https://leetcode.com/problems/relative-sort-array/) | `python3` `cpp` `java` | Sorting |
| Day 15 | LeetCode 1030 | [Matrix Cells in Distance Order](https://leetcode.com/problems/matrix-cells-in-distance-order/) | `python3` `cpp` `java` | Sorting |
| Day 15 | LeetCode 973 | [K Closest Points to Origin](https://leetcode.com/problems/k-closest-points-to-origin/) | `python3` `cpp` `java` | Sorting |
| Day 15 | LeetCode 164 | [Maximum Gap](https://leetcode.com/problems/maximum-gap/) | `python3` `cpp` `java` | Sorting |
| Day 16 | LeetCode 46 | [Permutations](https://leetcode.com/problems/permutations/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 16 | LeetCode 1079 | [Letter Tile Possibilities](https://leetcode.com/problems/letter-tile-possibilities/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 16 | LeetCode 1219 | [Path with Maximum Gold](https://leetcode.com/problems/path-with-maximum-gold/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 17 | LeetCode 1137 | [N-th Tribonacci Number](https://leetcode.com/problems/n-th-tribonacci-number/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 17 | LeetCode 22 | [Generate Parentheses](https://leetcode.com/problems/generate-parentheses/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 17 | LeetCode 78 | [Subsets](https://leetcode.com/problems/subsets/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 18 | LeetCode 1415 | [The k-th Lexicographical String of All Happy Strings of Length n](https://leetcode.com/problems/the-k-th-lexicographical-string-of-all-happy-strings-of-length-n/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 18 | LeetCode 17 | [Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 18 | LeetCode 996 | [Number of Squareful Arrays](https://leetcode.com/problems/number-of-squareful-arrays/) | `python3` `cpp` `java` | Recursion and Backtracking |
| Day 19 | LeetCode 1512 | [Number of Good Pairs](https://leetcode.com/problems/number-of-good-pairs/) | `python3` `cpp` `java` | Hashing |
| Day 19 | LeetCode 771 | [Jewels and Stones](https://leetcode.com/problems/jewels-and-stones/) | `python3` `cpp` `java` | Hashing |
| Day 19 | LeetCode 1365 | [How Many Numbers Are Smaller Than the Current Number](https://leetcode.com/problems/how-many-numbers-are-smaller-than-the-current-number/) | `python3` `cpp` `java` | Hashing |
| Day 20 | LeetCode 974 | [Subarray Sums Divisible by K](https://leetcode.com/problems/subarray-sums-divisible-by-k/) | `python3` `cpp` `java` | Hashing |
| Day 20 | LeetCode 1 | [Two Sum](https://leetcode.com/problems/two-sum/) | `python3` `cpp` `java` | Hashing |
| Day 20 | LeetCode 560 | [Subarray Sum Equals K](https://leetcode.com/problems/subarray-sum-equals-k/) | `python3` `cpp` `java` | Hashing |
| Day 21 | LeetCode 1381 | [Design a Stack With Increment Operation](https://leetcode.com/problems/design-a-stack-with-increment-operation/) | `python3` `cpp` `java` | Stacks |
| Day 21 | LeetCode 921 | [Minimum Add to Make Parentheses Valid](https://leetcode.com/problems/minimum-add-to-make-parentheses-valid/) | `python3` `cpp` `java` | Stacks |
| Day 21 | LeetCode 901 | [Online Stock Span](https://leetcode.com/problems/online-stock-span/) | `python3` `cpp` `java` | Stacks |
| Day 22 | LeetCode 225 | [Implement Stack using Queues](https://leetcode.com/problems/implement-stack-using-queues/) | `python3` `cpp` `java` | Stacks |
| Day 22 | LeetCode 155 | [Min Stack](https://leetcode.com/problems/min-stack/) | `python3` `cpp` `java` | Stacks |
| Day 22 | LeetCode 20 | [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/) | `python3` `cpp` `java` | Stacks |
| Day 23 | LeetCode 933 | [Number of Recent Calls](https://leetcode.com/problems/number-of-recent-calls/) | `python3` `cpp` `java` | Queue |
| Day 23 | LeetCode 621 | [Task Scheduler](https://leetcode.com/problems/task-scheduler/) | `python3` `cpp` `java` | Queue |
| Day 23 | LeetCode 622 | [Design Circular Queue](https://leetcode.com/problems/design-circular-queue/) | `python3` `cpp` `java` | Queue |
| Day 24 | LeetCode 1290 | [Convert Binary Number in a Linked List to Integer](https://leetcode.com/problems/convert-binary-number-in-a-linked-list-to-integer/) | `python3` `cpp` `java` | Linked List |
| Day 24 | LeetCode 876 | [Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/) | `python3` `cpp` `java` | Linked List |
| Day 24 | LeetCode 237 | [Delete Node in a Linked List](https://leetcode.com/problems/delete-node-in-a-linked-list/) | `python3` `cpp` `java` | Linked List |
| Day 25 | LeetCode 206 | [Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/) | `python3` `cpp` `java` | Linked List |
| Day 25 | LeetCode 21 | [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/) | `python3` `cpp` `java` | Linked List |
| Day 25 | LeetCode 141 | [Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/) | `python3` `cpp` `java` | Linked List |
| Day 26 | LeetCode 160 | [Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists/) | `python3` `cpp` `java` | Linked List |
| Day 26 | LeetCode 19 | [Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/) | `python3` `cpp` `java` | Linked List |
| Day 26 | LeetCode 707 | [Design Linked List](https://leetcode.com/problems/design-linked-list/) | `python3` `cpp` `java` | Linked List |
| Day 27 | LeetCode 1302 | [Deepest Leaves Sum](https://leetcode.com/problems/deepest-leaves-sum/) | `python3` `cpp` `java` | Binary Trees |
| Day 27 | LeetCode 1315 | [Sum of Nodes with Even-Valued Grandparent](https://leetcode.com/problems/sum-of-nodes-with-even-valued-grandparent/) | `python3` `cpp` `java` | Binary Trees |
| Day 27 | LeetCode 617 | [Merge Two Binary Trees](https://leetcode.com/problems/merge-two-binary-trees/) | `python3` `cpp` `java` | Binary Trees |
| Day 28 | LeetCode 144 | [Binary Tree Preorder Traversal](https://leetcode.com/problems/binary-tree-preorder-traversal/) | `python3` `cpp` `java` | Binary Trees |
| Day 28 | LeetCode 94 | [Binary Tree Inorder Traversal](https://leetcode.com/problems/binary-tree-inorder-traversal/) | `python3` `cpp` `java` | Binary Trees |
| Day 28 | LeetCode 145 | [Binary Tree Postorder Traversal](https://leetcode.com/problems/binary-tree-postorder-traversal/) | `python3` `cpp` `java` | Binary Trees |
| Day 29 | LeetCode 102 | [Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/) | `python3` `cpp` `java` | Binary Trees |
| Day 29 | LeetCode 107 | [Binary Tree Level Order Traversal II](https://leetcode.com/problems/binary-tree-level-order-traversal-ii/) | `python3` `cpp` `java` | Binary Trees |
| Day 29 | LeetCode 103 | [Binary Tree Zigzag Level Order Traversal](https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/) | `python3` `cpp` `java` | Binary Trees |