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一组数据。。wa了好久1
7 2
1 0 7 0
2 1 10 1
9 2 12 2
4 3 12 3
3 4 8 4
5 5 6 5
形状是这样的：
1----------------------7
2----------------------------10
9------------------12
4------------------------------------12
3------------------8
5--6
10--------11
答案是3不是4。。。
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