2018-10-04 国庆互测 第一场

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Read-only snapshot recovered from 2024-09-22 00:00 UTC. View original capture.

Problem A

Recovered from “https://acm.ecnu.edu.cn/wiki/index.php?title=2018-10-04_%E5%9B%BD%E5%BA%86%E4%BA%92%E6%B5%8B_%E7%AC%AC%E4%B8%80%E5%9C%BA”