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DescriptionMatt has N friends. They are playing a game together.Each of Matt’s friends has a magic number. In the game, Matt selects some (could be ze... 阅读全文
摘要：
题意是说用k重颜色填充n*m的方格，第i种颜色要用ci次，保证ci（i属于1..k）的和为n"m，问是否有可行解，若有，输出任意一种。第一感觉是dfs.。。而且数据范围还那么小。但是鉴于我上次dfs写成汪的经历....嗯 不过群里有学长说似乎剪枝不太好想？我一开始分了四类，o行o列，e行e列，e行o... 阅读全文
摘要：
How many prime numbersTime Limit: 3000/1000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 7017Accepted Submission(s): ... 阅读全文