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New Year Gift - Curated List of Top 75 LeetCode Questions to Save Your TimeBlind

New Year Gift - Curated List of Top 75 LeetCode Questions to Save Your Time

Facebook / Eng tech leadDec 30, 2018 202 Comments

New Year Gift to every fellow time-constrained engineer out there looking for a job, here's a list of the best LeetCode questions that teach you core concepts and techniques for each category/type of problems! Many other LeetCode questions are a mash of the techniques from these individual questions. I used this list in my last job hunt to only do the important questions. Good luck and Happy New Year!

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Study

• 023 0709 39. Combination Sum - https://leetcode.com/problems/combination-sum-iv/

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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/

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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/

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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/

• 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/

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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/

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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/

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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/

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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/

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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/

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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/

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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/

You're welcome!