Codeforces1453 A. Cancel the Trains

Gildong’s town has a train system that has 100 trains that travel from the bottom end to the top end and 100 trains that travel from the left end to the right end. The trains starting from each side are numbered from 1 to 100, respectively, and all trains have the same speed. Let’s take a look at the picture below.

The train system can be represented as coordinates on a 2D plane. The

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来源： https://blog.csdn.net/tomjobs/article/details/110879558