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大牛帮帮忙,不胜感激设n是一个正整数.2*n的标准二维表是有正整数1,2,...2*n组成的2*n的数组,该数组每行从左到右递增,每列从上往下递增. 给定正整数n,求这样的标准二维表的个数. 当n=3时,所有标准二维表如下(5个): 123 124 125 134 135 456 356 346 256 246 答案是Catalan数.请问为什么. Followed by: Post your reply here: |
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