给出一个$N \times N$的非负整数矩阵，要求找到一条从左上角数字到右下角数字的路线，且

• 只能向右或者下走。
• 将经过数字相乘后得到的结果，使其末尾的“0”最少。

There is a tree having n nodes, the i-th node of which has a type of color, denoted by an integer $c_i$ The path between every two nodes is unique, of which we define the value is the number of distinct types of colors appearing on it. Calculate the sum of values of all possible paths, $\frac{n(n-1)}{2}$ in total, between two different nodes on the tree. 输入范围

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几乎可以肯定,下面的内容肯定会出锅.