题目描述
Time Limit: 8 sec / Memory Limit: 64 MB
Example
Input
10 10
.....#....
.....#....
.....#....
....
..........
......
....###...
t..#..####
...##.....
....#...##
3
0 3
0 5
4 6
Output
2
输入格式
见题面
输出格式
见题面
样例输入
10 10
.....#....
.....#....
.....#....
######....
..........
####......
....###...
t..#..####
...##.....
....#...##
3
0 3
0 5
4 6
样例输出
2