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北京大学《ACM/ICPC大学生程序设计竞赛训练》暑期课面向全球招生!

我也来提供两组数据吧。。还是挺容易错的。

Posted by Acsaga at 2006-11-25 00:53:50 on Problem 2376
In Reply To:试下这个数据,它的输出是-1 Posted by:HYSBZ at 2005-07-26 23:56:25
input:
7 20
1 10
2 11
3 12
4 13
5 14
12 19
16 20

output: 4

input:
10 10
1 3
2 4
3 5
4 6
5 7
6 8
7 9
8 10
9 10
10 10

output: 4

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