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https://tak-vin.com/2019/01/25/2017-acm-icpc-%e7%ad%91%e6%b3%a2%e5%8c%ba%e5%9f%9f%e8%b5%9b-cmedical-checkup/
2017 ACM-ICPC 筑波区域赛 C:Medical Checkup