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Codeforces Round #300 A A large banner with word CODEFORCES was ordered for the 1000-th onsite round of Codeforcesω that takes place on the Miami beach. Unfortunately, the company that

CodeForces - 96B Petya loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn't contain digits other than 4 and 7. For example, nu

题目链接 K King of the Waves Picture by JD Lasica via Flickr. You are organising a king of the hill tournament, the Buenos Aires Paddleboarding Competition (BAPC), with n participants. In a king of t...

题目链接： http://acm.hdu.edu.cn/showproblem.php?pid=6319   Problem Description Before the start of contest, there are n ICPC contestants waiting in a long queue. They are labeled by 1 to n from left t...