Blind 75

list

• lc128. Longest Consecutive Sequence — Med.
• lc1. Two Sum — Easy
• lc3. Longest Substring Without Repeating Characters — Med.
• lc5. Longest Palindromic Substring — Med.
• lc133. Clone Graph — Med.
• lc261. Graph Valid Tree — Med.
• lc647. Palindromic Substrings — Med.
• lc11. Container With Most Water — Med.
• lc139. Word Break — Med.
• lc141. Linked List Cycle — Easy
• lc268. Missing Number — Easy
• lc15. 3Sum — Med.
• lc143. Reorder List — Med.
• lc269. Alien Dictionary — Hard
• lc271. Encode and Decode Strings — Med.
• lc19. Remove Nth Node From End of List — Med.
• lc20. Valid Parentheses — Easy
• lc21. Merge Two Sorted Lists — Easy
• lc23. Merge k Sorted Lists — Hard
• lc152. Maximum Product Subarray — Med.
• lc153. Find Minimum in Rotated Sorted Array — Med.
• lc33. Search in Rotated Sorted Array — Med.
• lc417. Pacific Atlantic Water Flow — Med.
• lc39. Combination Sum — Med.
• lc295. Find Median from Data Stream — Hard
• lc297. Serialize and Deserialize Binary Tree — Hard
• lc424. Longest Repeating Character Replacement — Med.
• lc300. Longest Increasing Subsequence — Med.
• lc48. Rotate Image — Med.
• lc49. Group Anagrams — Med.
• lc435. Non-overlapping Intervals — Med.
• lc53. Maximum Subarray — Med.
• lc54. Spiral Matrix — Med.
• lc55. Jump Game — Med.
• lc56. Merge Intervals — Med.
• lc57. Insert Interval — Med.
• lc572. Subtree of Another Tree — Easy
• lc62. Unique Paths — Med.
• lc190. Reverse Bits — Easy
• lc191. Number of 1 Bits — Easy
• lc322. Coin Change — Med.
• lc323. Number of Connected Components in an Undirected Graph — Med.
• lc70. Climbing Stairs — Easy
• lc198. House Robber — Med.
• lc200. Number of Islands — Med.
• lc73. Set Matrix Zeroes — Med.
• lc76. Minimum Window Substring — Hard
• lc206. Reverse Linked List — Easy
• lc79. Word Search — Med.
• lc207. Course Schedule — Med.
• lc208. Implement Trie (Prefix Tree) — Med.
• lc338. Counting Bits — Easy
• lc211. Design Add and Search Words Data Structure — Med.
• lc212. Word Search II — Hard
• lc213. House Robber II — Med.
• lc217. Contains Duplicate — Easy
• lc91. Decode Ways — Med.
• lc347. Top K Frequent Elements — Med.
• lc253. Meeting Rooms II — Med.
• lc98. Validate Binary Search Tree — Med.
• lc226. Invert Binary Tree — Easy
• lc100. Same Tree — Easy
• lc1143. Longest Common Subsequence — Med.
• lc102. Binary Tree Level Order Traversal — Med.
• lc230. Kth Smallest Element in a BST — Med.
• lc104. Maximum Depth of Binary Tree — Easy
• lc105. Construct Binary Tree from Preorder and Inorder Traversal — Med.
• lc235. Lowest Common Ancestor of a Binary Search Tree — Med.
• lc238. Product of Array Except Self — Med.
• lc242. Valid Anagram — Easy
• lc371. Sum of Two Integers — Med.
• lc252. Meeting Rooms — Easy
• lc121. Best Time to Buy and Sell Stock — Easy
• lc124. Binary Tree Maximum Path Sum — Hard
• lc125. Valid Palindrome — Easy

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1. 2Ptr
   1. lc1. Two Sum — Easy
   2. lc3. Longest Substring Without Repeating Characters — Med.
   3. lc5. Longest Palindromic Substring — Med.
   4. lc11. Container With Most Water — Med.
   5. lc15. 3Sum — Med.
   6. lc153. Find Minimum in Rotated Sorted Array — Med.
   7. lc33. Search in Rotated Sorted Array — Med.
   8. lc424. Longest Repeating Character Replacement — Med.
   9. lc76. Minimum Window Substring — Hard
   10. lc217. Contains Duplicate — Easy
   11. lc371. Sum of Two Integers — Med.
   12. lc125. Valid Palindrome — Easy
   13. list
       1. lc141. Linked List Cycle — Easy
       2. lc143. Reorder List — Med.
       3. lc19. Remove Nth Node From End of List — Med.
       4. lc21. Merge Two Sorted Lists — Easy
       5. lc206. Reverse Linked List — Easy
2. kPtr
   1. lc23. Merge k Sorted Lists — Hard
3. graph
   1. General
      1. lc133. Clone Graph — Med.
      2. lc269. Alien Dictionary — Hard
      3. lc323. Number of Connected Components in an Undirected Graph — Med.
      4. lc261. Graph Valid Tree — Med.
   2. Matrix
      1. lc417. Pacific Atlantic Water Flow — Med.
      2. lc48. Rotate Image — Med.
      3. lc54. Spiral Matrix — Med.
      4. lc200. Number of Islands — Med.
      5. lc79. Word Search — Med.
      6. lc212. Word Search II — Hard
   3. Tree
      2. lc297. Serialize and Deserialize Binary Tree — Hard
      3. lc572. Subtree of Another Tree — Easy
      4. lc98. Validate Binary Search Tree — Med.
      5. lc226. Invert Binary Tree — Easy
      6. lc100. Same Tree — Easy
      7. lc124. Binary Tree Maximum Path Sum — Hard
      8. lc208. Implement Trie (Prefix Tree) — Med.
      9. lc211. Design Add and Search Words Data Structure — Med.
4. dp
   1. lc128. Longest Consecutive Sequence — Med.
   2. lc647. Palindromic Substrings — Med.
   3. lc139. Word Break — Med.
   4. lc152. Maximum Product Subarray — Med.
   5. lc300. Longest Increasing Subsequence — Med.
   6. lc53. Maximum Subarray — Med.
   7. lc62. Unique Paths — Med.
   8. lc322. Coin Change — Med.
   9. lc70. Climbing Stairs — Easy
   10. lc198. House Robber — Med.
   11. lc213. House Robber II — Med.
   12. lc91. Decode Ways — Med.
   13. lc1143. Longest Common Subsequence — Med.
   14. lc102. Binary Tree Level Order Traversal — Med.
   15. lc230. Kth Smallest Element in a BST — Med.
   16. lc104. Maximum Depth of Binary Tree — Easy
   17. lc105. Construct Binary Tree from Preorder and Inorder Traversal — Med.
   18. lc235. Lowest Common Ancestor of a Binary Search Tree — Med.
   19. lc121. Best Time to Buy and Sell Stock — Easy
   20. lc338. Counting Bits — Easy
5. Greedy
   1. lc435. Non-overlapping Intervals — Med.
   2. lc55. Jump Game — Med.
   3. lc56. Merge Intervals — Med.
   4. lc57. Insert Interval — Med.
   5. lc207. Course Schedule — Med.
   6. lc253. Meeting Rooms II — Med.
   7. lc252. Meeting Rooms — Easy
6. DS
   1. Stack
      1. lc20. Valid Parentheses — Easy
   2. Queue
      1. lc295. Find Median from Data Stream — Hard
      2. lc347. Top K Frequent Elements — Med.
7. Other
   1. lc268. Missing Number — Easy
   2. lc271. Encode and Decode Strings — Med.
   3. lc39. Combination Sum — Med.
   4. lc49. Group Anagrams — Med.
   5. lc190. Reverse Bits — Easy
   6. lc191. Number of 1 Bits — Easy
   7. lc73. Set Matrix Zeroes — Med.
   8. lc242. Valid Anagram — Easy
8. Prefix
   1. lc238. Product of Array Except Self — Med.