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Now an emergent task for you is to open a password lock. The password is consisted of four digits. Each digit is numbered from 1 to 9. Each time, you 阅读全文
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ACM contests, like the one you are participating in, are hosted by the special software. That software, among other functions, preforms a job of accep 阅读全文
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Farmer John has been elected mayor of his town! One of his campaign promises was to bring internet connectivity to all farms in the area. He needs you 阅读全文
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题目: A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edges betw 阅读全文
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题目: A secret service developed a new kind of explosive that attain its volatile property only when a specific association of products occurs. Each pro 阅读全文
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题目: (😔,最近净做并查集了还一道难的都不会) DZY loves chemistry, and he enjoys mixing chemicals. DZY has n chemicals, and m pairs of them will react. He wants to pour t 阅读全文