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HDU 3844 引用训练指南上的题意模型“在一个无向图上选择尽量少的点涂黑，使得任意删除一个点后，每个连同分量至少有一个黑点” 对整个图分两种情况讨论： 1、整个连通图无割顶，即只有1个双连通分量。此时只需要任选2点染色即可 2、有若干的双连通分量。易证此时我们只需要在只有1个割顶的双连通分量中染 阅读全文
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Being a knight is a very attractive career: searching for the Holy Grail, saving damsels in distress, and drinking with the other knights are fun thin 阅读全文
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恢复内容开始 It's well known that DNA Sequence is a sequence only contains A, C, T and G, and it's very useful to analyze a segment of DNA Sequence，For exam 阅读全文
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Apple Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 488 Accepted Submission(s): 160 Problem Des 阅读全文
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B. Polycarp's phone book time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output B. Polycarp's p 阅读全文
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Fleet of the Eternal Throne Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 838 Accepted Submissi 阅读全文
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string string string Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 774 Accepted Submission(s): 阅读全文
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gems gems gems Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 476 Accepted Submission(s): 53 Pro 阅读全文
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E. Chemistry in Berland time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output E. Chemistry in 阅读全文
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D. Rooter's Song time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output D. Rooter's Song time l 阅读全文