From https://www.teamblind.com/article/New-Year-Gift---Curated-List-of-Top-100-LeetCode-Questions-to-Save-Your-Time-OaM1orEU
Array
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/Contains Duplicate - https://leetcode.com/problems/contains-duplicate/Product of Array Except Self - https://leetcode.com/problems/product-of-array-except-self/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
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/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/
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/
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/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/
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/