题目描述

输入格式

**The first line in the input contains an integer T (less than 100), the number of cases to follow. Each case starts with two integers, M and N (2 ≤ M, N ≤ 8), the number of rows and columns respectively in the grid. The next M lines contains N characters each and describes the grid using the following characters: ** **** **# - a cell which is colored black o - a cell which is colored white . - a cell which color has not yet been assigned ** ****

输出格式

每组测试数据，输出一个数，表示方案总数

1（1组输入）
2 3(m=2,n=3)
.o.
.#.
Hint
.表示未着色
#表示黑色
o表示白色
每组测试数据间用一个空行隔开

9

提示

题目来源

没有写明来源