OJ on the subject of Beijing University, wrote it myself, I hope everyone has a reference value for it.

Packet : 87361012peking-oj-1002.rar filelist
北大OJ 1002 题目及源代码\北大OJ 1002 题目.cpp
北大OJ 1002 题目及源代码\北大OJ 1002 题目.doc
北大OJ 1002 题目及源代码

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