HDU 2200 Eddy's AC难题(排列组合)

Eddy's AC难题 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是个ACMer,他不仅喜欢做ACM题,而
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