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discuss所有有的数据，baidu能搜到数据全测了一遍都过，后来发现原来wa在这

Posted by haihongblog at 2016-01-24 16:23:15 on Problem 2376 
可能有开始没1的情况出现，这样就要输出-1

数据

3 6
2 3
4 5
6 6 

输出 -1
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