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Wendell Sun edited this page Mar 22, 2021 · 3 revisions

leecode

# Title Difficulty Tags Note
1 Two Sum easy array
3 Longest Substring Without Repeating Characters medium string todo
21 Merge Two Sorted Lists easy linked list
24 Swap Nodes in Pairs medium linked list
66 Plus One medium array
92 Reverse Linked List II medium linked list
101 Symmetric Tree easy tree
104 Maximum Depth of Binary Tree easy tree
121 Best Time to Buy and Sell Stock easy
125 Valid Palindrome easy string
136 Single Number easy array
203 Remove Linked List Elements easy linked list
206 Reverse Linked List easy linked list
226 Invert Binary Tree easy tree
263 Ugly Number easy
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