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51 | 51 | | 125 | * | Valid Palindrome | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/125.Valid%20Palindrome.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/125.Valid%20Palindrome.md "悬停显示") | |
52 | 52 | | 150 | * | Add Binary | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/67.Add%20Binary/Add%20Binary.py "悬停显示") | [C++](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/67.Add%20Binary/67.Add%20Binary.cpp "悬停显示") | [博客思路讲解](http://blog.csdn.net/c406495762/article/details/72519117 "悬停显示") | |
53 | 53 | | 344 | * | Reverse String | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/344.Reverse%20String/Reverse%20String.py "悬停显示") | [C++](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/344.Reverse%20String/Reverse%20String.cpp "悬停显示") | [博客思路讲解](http://blog.csdn.net/c406495762/article/details/70833096 "悬停显示") | |
54 | | -| 345 | * | Reverse Vowels of a String | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/345.Reverse%20Vowels%20of%20a%20String.md "悬停显示") | no | [博客思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/345.Reverse%20Vowels%20of%20a%20String.md "悬停显示") | |
| 54 | +| 345 | * | Reverse Vowels of a String | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/345.Reverse%20Vowels%20of%20a%20String.md "悬停显示") | no | [博客思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/345.Reverse%20Vowels%20of%20a%20String.md "悬停显示") | |
55 | 55 | | 383 | * | Ransom Note | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/383.Ransom%20Note.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/383.Ransom%20Note.md "悬停显示") | |
56 | 56 | | 434 | * | Number of Segments in a String | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/434.Number%20of%20Segments%20in%20a%20String/Number%20of%20Segments%20in%20a%20String.py "悬停显示") | [C++](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/434.Number%20of%20Segments%20in%20a%20String/Number%20of%20Segments%20in%20a%20String.cpp "悬停显示") | [博客思路讲解](http://blog.csdn.net/c406495762/article/details/71786453 "悬停显示") | |
57 | 57 | | 520 | * | Detect Capital | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/520.Detect%20Capital/Detect%20Capital.py "悬停显示") | [C++](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/520.Detect%20Capital/Detect%20Capital.cpp "悬停显示") | [博客思路讲解](http://blog.csdn.net/c406495762/article/details/73495803 "悬停显示") | |
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60 | 60 | | 551 | * | Student Attendance Record I | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/551.%20Student%20Attendance%20Record%20I/Student%20Attendance%20Record%20I.py "悬停显示") | no | no | |
61 | 61 | | 557 | * | Reverse Words in a String III | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/557.Reverse%20Words%20in%20a%20String%20III/Reverse%20Words%20in%20a%20String%20III.py "悬停显示") | [C++](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/557.Reverse%20Words%20in%20a%20String%20III/Reverse%20Words%20in%20a%20String%20III.cpp "悬停显示") | [博客思路讲解](http://blog.csdn.net/c406495762/article/details/73457057 "悬停显示") | |
62 | 62 | | 657 | Easy | Judge Route Circle | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Easy/657.Judge%20Route%20Circle/Judge%20Route%20Circle.py "悬停显示") | no | no | |
63 | | -| 5 | Medium | Longest Palindromic Substring | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/5.Longest%20Palindromic%20Substring.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/5.Longest%20Palindromic%20Substring.md "悬停显示") | |
| 63 | +| 3 | Medium | Longest Substring Without Repeating Characters | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/3.Longest%20Substring%20Without%20Repeating%20Characters.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/3.Longest%20Substring%20Without%20Repeating%20Characters.md "悬停显示") | |
| 64 | +| 5 | * | Longest Palindromic Substring | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/5.Longest%20Palindromic%20Substring.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/5.Longest%20Palindromic%20Substring.md "悬停显示") | |
64 | 65 | | 17 | * | Letter Combinations of a Phone Number | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/17.Letter%20Combinations%20of%20a%20Phone%20Number.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/17.Letter%20Combinations%20of%20a%20Phone%20Number.md "悬停显示") | |
65 | 66 | | 22 | * | Generate Parentheses | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/22.Generate%20Parentheses.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/22.Generate%20Parentheses.md "悬停显示") | |
66 | 67 | | 43 | * | Multiply Strings | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/43.Multiply%20Strings.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/43.Multiply%20Strings.md "悬停显示") | |
67 | 68 | | 609 | Medium | Find Duplicate File in System | [Python](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/609.Find%20Duplicate%20File%20in%20System.md "悬停显示") | no | [思路讲解](https://github.com/Jack-Cherish/LeetCode/blob/master/String/Medium/609.Find%20Duplicate%20File%20in%20System.md "悬停显示") | |
68 | 69 |
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69 | 70 |
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| 71 | + |
70 | 72 | ### Tree(树) |
71 | 73 |
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72 | 74 | | ID | Difficulty | Title | Python | C++ | Blog | |
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