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51nod 1001 数组中和等于k的数对(单调性优化)

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hdu 2531 Catch him (bfs)

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Catch him # **Time Limit: 5000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 664 Accepted Submission(s): 307 **