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点数实际上是100

Posted by liu_runda at 2016-09-19 11:01:02 on Problem 3613 
注意"Each trail connects two different intersections (1 ≤ I1i ≤ 1,000; 1 ≤ I2i ≤ 1,000), each of which is the termination for at least two trails.",意思是说每个点至少连两条边. 而所有点的度数之和==边数*2,因此点数<=100.
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