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题目链接：http://oj.jxust.edu.cn/problem.php?id=1386 qwn和Q伟N最近沉迷于Battle of Balls,天天翘课玩游戏。因为Q伟N太坑了，所以qwn决定弃游。于是乎到了木木店里买了n本书决定重返学霸之路，每本书价值ai（i<=n）。不过qwn被Batt 阅读全文
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题目链接：http://codeforces.com/problemset/problem/124/A Petr stands in line of n people, but he doesn't know exactly which position he occupies. He can sa 阅读全文
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题目链接：http://codeforces.com/problemset/problem/456/A One day Dima and Alex had an argument about the price and quality of laptops. Dima thinks that the 阅读全文
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题目链接：http://codeforces.com/problemset/problem/237/A Valera runs a 24/7 fast food cafe. He magically learned that next day n people will visit his cafe 阅读全文