## Array - [X] [Two Sum](https://leetcode.com/problems/two-sum/) - [ ] [Best Time to Buy and Sell Stock](https://leetcode.com/problems/best-time-to-buy-and-sell-stock/) - [X] [Contains Duplicate](https://leetcode.com/problems/contains-duplicate/) - [ ] [Product of Array Except Self](https://leetcode.com/problems/product-of-array-except-self/) - [X] [Maximum Subarray](https://leetcode.com/problems/maximum-subarray/) - [ ] [Maximum Product Subarray](https://leetcode.com/problems/maximum-product-subarray/) - [ ] [Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/) - [ ] [Search in Rotated Sorted Array](https://leetcode.com/problems/search-in-rotated-sorted-array/) - [ ] [3Sum](https://leetcode.com/problems/3sum/) - [ ] [Container With Most Water](https://leetcode.com/problems/container-with-most-water/) --- ## Binary - [ ] [Sum of Two Integers](https://leetcode.com/problems/sum-of-two-integers/) - [ ] [Number of 1 Bits](https://leetcode.com/problems/number-of-1-bits/) - [ ] [Counting Bits](https://leetcode.com/problems/counting-bits/) - [ ] [Missing Number](https://leetcode.com/problems/missing-number/) - [ ] [Reverse Bits](https://leetcode.com/problems/reverse-bits/) --- ## Dynamic Programming - [X] [Climbing Stairs](https://leetcode.com/problems/climbing-stairs/) - [ ] [Coin Change](https://leetcode.com/problems/coin-change/) - [ ] [Longest Increasing Subsequence](https://leetcode.com/problems/longest-increasing-subsequence/) - [ ] [Longest Common Subsequence](https://leetcode.com/problems/longest-common-subsequence/) - [ ] [Word Break Problem](https://leetcode.com/problems/word-break/) - [ ] [Combination Sum](https://leetcode.com/problems/combination-sum-iv/) - [ ] [House Robber](https://leetcode.com/problems/house-robber/) - [ ] [House Robber II](https://leetcode.com/problems/house-robber-ii/) - [ ] [Decode Ways](https://leetcode.com/problems/decode-ways/) - [ ] [Unique Paths](https://leetcode.com/problems/unique-paths/) - [ ] [Jump Game](https://leetcode.com/problems/jump-game/) --- ## Graph - [ ] [Clone Graph](https://leetcode.com/problems/clone-graph/) - [ ] [Course Schedule](https://leetcode.com/problems/course-schedule/) - [ ] [Pacific Atlantic Water Flow](https://leetcode.com/problems/pacific-atlantic-water-flow/) - [ ] [Number of Islands](https://leetcode.com/problems/number-of-islands/) - [ ] [Longest Consecutive Sequence](https://leetcode.com/problems/longest-consecutive-sequence/) - [ ] [Alien Dictionary (Leetcode Premium)](https://leetcode.com/problems/alien-dictionary/) - [ ] [Graph Valid Tree (Leetcode Premium)](https://leetcode.com/problems/graph-valid-tree/) - [ ] [Number of Connected Components in an Undirected Graph (Leetcode Premium)](https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/) --- ## Interval - [ ] [Insert Interval](https://leetcode.com/problems/insert-interval/) - [ ] [Merge Intervals](https://leetcode.com/problems/merge-intervals/) - [ ] [Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/) - [ ] [Meeting Rooms (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms/) - [ ] [Meeting Rooms II (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms-ii/) --- ## Linked List - [ ] [Reverse a Linked List](https://leetcode.com/problems/reverse-linked-list/) - [ ] [Detect Cycle in a Linked List](https://leetcode.com/problems/linked-list-cycle/) - [X] [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/) - [ ] [Merge K Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/) - [ ] [Remove Nth Node From End Of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/) - [ ] [Reorder List](https://leetcode.com/problems/reorder-list/) --- ## Matrix - [ ] [Set Matrix Zeroes](https://leetcode.com/problems/set-matrix-zeroes/) - [ ] [Spiral Matrix](https://leetcode.com/problems/spiral-matrix/) - [ ] [Rotate Image](https://leetcode.com/problems/rotate-image/) - [ ] [Word Search](https://leetcode.com/problems/word-search/) --- ## String - [ ] [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/) - [ ] [Longest Repeating Character Replacement](https://leetcode.com/problems/longest-repeating-character-replacement/) - [ ] [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/) - [ ] [Valid Anagram](https://leetcode.com/problems/valid-anagram/) - [ ] [Group Anagrams](https://leetcode.com/problems/group-anagrams/) - [ ] [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/) - [ ] [Valid Palindrome](https://leetcode.com/problems/valid-palindrome/) - [ ] [Longest Palindromic Substring](https://leetcode.com/problems/longest-palindromic-substring/) - [ ] [Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings/) - [ ] [Encode and Decode Strings (Leetcode Premium)](https://leetcode.com/problems/encode-and-decode-strings/) --- ## Tree - [ ] [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/) - [ ] [Same Tree](https://leetcode.com/problems/same-tree/) - [ ] [Invert/Flip Binary Tree](https://leetcode.com/problems/invert-binary-tree/) - [ ] [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum/) - [ ] [Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/) - [ ] [Serialize and Deserialize Binary Tree](https://leetcode.com/problems/serialize-and-deserialize-binary-tree/) - [ ] [Subtree of Another Tree](https://leetcode.com/problems/subtree-of-another-tree/) - [ ] [Construct Binary Tree from Preorder and Inorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/) - [ ] [Validate Binary Search Tree](https://leetcode.com/problems/validate-binary-search-tree/) - [ ] [Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst/) - [ ] [Lowest Common Ancestor of BST](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/) - [ ] [Implement Trie (Prefix Tree)](https://leetcode.com/problems/implement-trie-prefix-tree/) - [ ] [Add and Search Word](https://leetcode.com/problems/add-and-search-word-data-structure-design/) - [ ] [Word Search II](https://leetcode.com/problems/word-search-ii/) --- ## Heap - [ ] [Merge K Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/) - [ ] [Top K Frequent Elements](https://leetcode.com/problems/top-k-frequent-elements/) - [ ] [Find Median from Data Stream](https://leetcode.com/problems/find-median-from-data-stream/) ## Important Link: [14 Patterns to Ace Any Coding Interview Question](https://hackernoon.com/14-patterns-to-ace-any-coding-interview-question-c5bb3357f6ed)