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我的离散书的习题……当年的作业……In Reply To:这是怎么推出来的？ Posted by:wywcgs at 2007-11-18 13:21:17 用恰好k种可能的颜色做旗子，使得每面旗子由n条彩带构成(n>=k)，且相邻的两条彩带的颜色都不相同，证 明不同的旗子数是上面那个式子…… > btw, 我不知道你这个对不对…… Followed by: Post your reply here: |
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