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5 | 5 | |4|Array;BinarySearch;Divide and Conquer;|[Median of Two Sorted Arrays ](http://blog.csdn.net/daigualu/article/details/72983826)|
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6 | 6 | |7|Math;|[Reverse Integer](http://blog.csdn.net/daigualu/article/details/72464418)|
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7 | 7 | |9|Math;|[Palindrome Number](http://blog.csdn.net/daigualu/article/details/72717009)|
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8 | | -|13|Math;String;|[ |
9 | | -Roman to Integer ](http://blog.csdn.net/daigualu/article/details/72867026)| |
| 8 | +|13|Math;String;|[Roman to Integer](http://blog.csdn.net/daigualu/article/details/72867026)| |
10 | 9 | |14|String;|[Longest Common Prefix](http://blog.csdn.net/daigualu/article/details/69665015)|
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11 | 10 | |19|LinkedList;TwoPointers;|[Remove Nth Node From End of List ]()|
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12 | 11 | |20|String;Stack;|[Valid Parentheses](http://blog.csdn.net/daigualu/article/details/69569622)|
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