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问题 把ｎ个相同的小球放入ｍ个不同的盒子中 (ｎ ≥ｍ≥ 1) ,要求每个盒子非空 ,问有多少种不同的放法 ?这是一个常见的组合问题 ,可先将ｎ个小球排成一列 ,然后在每两个小球的ｎ- 1个空档中插入ｍ- 1块隔板 ,这样就将ｎ个小球分割成ｍ组 ,每组小球依次放入ｍ个盒子中 ,就得
The problem is to put n identical balls into m different boxes (n ≥ m ≥ 1), asking each box to be non-empty, and asking how many different ways to put it? This is a common combination problem. Put n balls in a row, then insert m - 1 baffle in n - 1 empty spaces of every two balls, so that n balls are divided into m groups, each ball is placed in turn In the m boxes, you have to