HDU 2200 Eddy's AC難題（排列組合）

Eddy's AC難題 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 6759    Accepted Submission(s): 3245   Problem Description Eddy是個ACMer,他不僅喜歡做ACM題,而

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