HDU-2157 How many ways?

How many ways?? Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2179    Accepted Submission(s): 814 Problem Description 春天到了, HDU校園裏開滿了花, 奼紫嫣紅,
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