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试试这组数据

Posted by zig_zag at 2013-03-29 10:02:37 on Problem 2942 and last updated at 2013-03-29 12:30:26
6 8
1 4
1 5
1 6
2 4
2 5
2 6
3 6
4 5
0 0

ans:3

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