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70. Climbing Stairs - DP #23

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238. Product of Array Except Self - prefix suffix #22

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953. Verifying an Alien Dictionary - topological #21

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973. K Closest Points to Origin - Heap #20

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215. Kth Largest Element in an Array - heap #19

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347. Top K Frequent Elements - heap #18

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18. 4Sum - Two pointers #17

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15. 3Sum - two pointers #16

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1. Two Sum - #15

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20. Valid Parentheses - Stack #14

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994. Rotting Oranges - BFS #13

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743. Network Delay Time - dijkstra #11

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57. Insert Interval - #12

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79. Word Search - DFS #10

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424. Longest Repeating Character Replacement - Sliding windown #9

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200. Number of Islands - DFS #8

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11. Container With Most Water - Two pointers #7

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242. Valid Anagram - Hashmap #6

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125. Valid Palindrome - #5

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572. Subtree of Another Tree - #4

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226. Invert Binary Tree - #3

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104. Maximum Depth of Binary Tree - #2

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3. Longest Substring Without Repeating Characters - #1

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