求和 25 - المسألة

#22777. 求和 25

الإحصائيات

تم استخدام هذه المسألة في المسابقات التالية:

USACO 2001 Winter Open Contest (Orange)

编程读入 7 个数字（$0 \le \text{each digit} \le 9$；每个数字在 0 到 9 之间），统计选出一个数字集合使和为 25 的方案数。数字 0 表示 10，绝非 0。

对于输入：

5 0 1 5 4 3 7

有五种不同的和为 25 的选择：

        5 0       3 7
        5   1 5 4 3 7
        5 0 1 5 4
          0 1   4 3 7
          0   5   3 7

输入格式

一行七个一位整数。

输出格式

一行，表示和为 25 的子集数。

样例

输入格式 1

5 0 1 5 4 3 7

输出格式 1

题目来源：Don Piele，1982。

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