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发现陈宏大牛的解题方法有漏洞，不能简单用前后两测度想减求值

Posted by ACM_Qun at 2011-04-09 21:29:08 on Problem 1177 
附上一组数据：
13
0 0 1 1
0 1 1 4
0 4 1 6
1 0 2 1
1 1 2 4
1 4 2 6
2 0 3 2
2 2 3 3
2 5 3 6
3 1 4 4
3 5 5 6
4 0 5 2
4 2 5 5
答案：32
如果你是按y轴排序来做的，自己转换一下坐标试试
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