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As the saying goes: “Practice makes you better"

Below record my solution and all my problem-sovling ideas, hope you have a good time.

No Title Solution Difficulty Runtime Memory Memo
1 Two Sum　 Go, Java Easy 99.91% 5.65%
2 Add Two Numbers Java Medium
3 Longest Substring Without Repeating Characters Java Medium
4 Median of Two Sorted Arrays Java Hard
5 Longest Palindromic Substring　 Java Medium
7 Reverse Integer　 Go, Java Easy 100% 5.55%
8 String To Integer(atoi)　 Java Medium
9 Palindrome Number　 Go, Java Easy
10 Regular Expression Matching　 Java Hard
11 Container With Most Water　 Java Medium
12 Integer To Roman　 Java Medium
13 Roman To Integer　 Java Easy
14 Longest Common Prefix Java Easy 100% 5.48%
17 Letter Combinations of a Phone Number Go Medium 100% 78.41%
19 Remove Nth Node From End of List Go Medium 100% 78.41%
20 Valid Parentheses Go Easy 100% 99.53%
21 Merge Two Sorted Lists Go Easy
26 Remove Duplicates from Sorted Array Go Easy 92.44% 82.73%
36 Valid Sudoku Go Medium 100% 92.59%
53 Maximum Subarray Go Medium 64.52% 58.13% F/U[x]
62 Unique Paths Go Medium 100.00% 75.66%
66 Plus One Go Easy 100.00% 64.91%
69 Sqrt(x) Go Easy 100% 82.21%
70 Climbing Stairs Go Easy 100% 91.21%
74 Search a 2D Matrix Go Medium % %
83 Remove Duplicates from Sorted List Go Easy 89.65% 85.61%
88 Merge Sorted Array Go Easy 100% 85.10% F/U[v]
94 Binary Tree Inorder Traversal Go Easy 100% 27.93%
98 Validate Binary Search Tree Go Medium 100% 85.09%
101 Symmetric Tree Go Easy 100% 100% F/U[x]
102 Binary Tree Level Order Traversal Go Medium 67.53% 89.92%
104 Maximum Depth of Binary Tree Go Easy 82.43% 62.31%
108 Convert Sorted Array to Binary Search Tree Go Easy 100% 100%
112 Path Sum Go Easy 92.41% 78.45%
118 Pascal's Triangle Go Easy 100% 86.92%
121 Best Time to Buy And Sell Stock Go Easy
136 Single Number Go Easy
141 Linked List Cycle Go Easy 100% 100% F/U[v]
142 Linked List Cycle II Go Easy 28.12% 12.07%
144 Binary Tree Preorder Traversal Go Easy 12.62% 40.97%
145 Binary Tree Postorder Traversal Go Easy 100% 90.24%
160 Intersection of Two Linked Lists Go Easy 34.35% 44.19% F/U[x]
169 Majority Element Go Easy 75.69% 99.31% F/U[x]
171 Excel Sheet Column Number Go Easy % %
190 Reverse Bits Go Easy 100% 69.90%
191 Number of 1 Bits Go Easy 100% 92.10%
200 Numbers of Islands Go Medium 90.84% 46.68%
202 Happy Number Go Easy % %
203 Remove Linked List Elements Go Easy 90.19% 5.19%
205 Isomorphic Strings Go Easy
206 Reverse Linked List Go Easy
217 Contains Duplicate Go Easy
226 Invert Binary Tree Go Easy 100% 70.21%
232 Implement Queue using Stacks Go Easy 100% 85.17% F/U[v]
235 Lowest Common Ancestor of a Binary Search Tree Go Medium
238 Product of Array Except Self Go Medium
242 Valid Anagram Go Easy 100% 100%
268 Missing Number Go Easy
278 First Bad Version Go Easy 100.00% 87.98% ⭐️
299 Bulls and Cows Go Medium 100.00% 100.00% ⭐️
350 Intersection of Two Arrays II Go Easy 29.62% 11.85%
383 Ransom Note Go Easy
387 First Unique Character in a String Go Easy 94.03% 94.36%
392 Is Subsequence Go Easy
394 Decode String Go Medium 100% 93.38%
409 Longest Palindrome Go Easy
424 Longest Repeating Character Replacement Go Medium 100% 79.23%
438 Find All Anagrams in a String Go Medium 84.02% 56.20%
448 Find All Numbers Disappeared in an Array Go Easy
509 Finonacci Number Go Easy 21.35% 34.38%
566 Reshape the Matrix Go Easy 53.81% 72.03% O/P[x]
589 N-ary Tree Preorder Traversal Go Easy 100% 79.22%
653 Two Sum IV - Input is a BST Go Easy 84.35% 87.15%
692 Top K Frequent Words Go Medium F/U[x]
700 Search in a Binary Search Tree Go Easy 92.16% 90.46%
701 Insert Into a Binary Search Tree Go Medium 95.85% 80.83%
704 Binary Search Go Easy 91.93% 94.44%
724 Find Pivot Index Go Easy
733 Flood Fill Go Easy 33.70% 18.72%
746 Min Cost Climbing Stairs Go Easy 100% 43.33%
844 Backspace String Compare Go Easy 100% 100%
876 Middle of the Linked List Go Easy
1046 Last Stone Weight Go Easy 100% 82.70%
1143 Longest Common Subsequence Java Medium 45.08% 100%
1480 Running Sum of 1d Array Go Easy 73.56% 45.55%

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