A14813 | Not Shading
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题目描述
There is a grid with $n$ rows and $m$ columns. Some cells are colored black, and the rest of the cells are colored white.
In one operation, you can select some black cell and do exactly one of the following:
- color all cells in its row black, or
- color all cells in its column black.
You are given two integers $r$ and $c$ . Find the minimum number of operations required to make the cell in row $r$ and column $c$ black, or determine that it is impossible.
In one operation, you can select some black cell and do exactly one of the following:
- color all cells in its row black, or
- color all cells in its column black.
You are given two integers $r$ and $c$ . Find the minimum number of operations required to make the cell in row $r$ and column $c$ black, or determine that it is impossible.
输入格式
The input consists of multiple test cases. The first line contains an integer $t$ ( $1 \leq t \leq 100$ ) — the number of test cases. The description of the test cases follows.
The first line of each test case contains four integers $n$ , $m$ , $r$ , and $c$ ( $1 \leq n, m \leq 50$ ; $1 \leq r \leq n$ ; $1 \leq c \leq m$ ) — the number of rows and the number of columns in the grid, and the row and column of the cell you need to turn black, respectively.
Then $n$ lines follow, each containing $m$ characters. Each of these characters is either 'B' or 'W' — a black and a white cell, respectively.
The first line of each test case contains four integers $n$ , $m$ , $r$ , and $c$ ( $1 \leq n, m \leq 50$ ; $1 \leq r \leq n$ ; $1 \leq c \leq m$ ) — the number of rows and the number of columns in the grid, and the row and column of the cell you need to turn black, respectively.
Then $n$ lines follow, each containing $m$ characters. Each of these characters is either 'B' or 'W' — a black and a white cell, respectively.
输出格式
For each test case, if it is impossible to make the cell in row $r$ and column $c$ black, output $-1$ .
Otherwise, output a single integer — the minimum number of operations required to make the cell in row $r$ and column $c$ black.
Otherwise, output a single integer — the minimum number of operations required to make the cell in row $r$ and column $c$ black.
输入输出样例
输入 #1
9 3 5 1 4 WBWWW BBBWB WWBBB 4 3 2 1 BWW BBW WBB WWB 2 3 2 2 WWW WWW 2 2 1 1 WW WB 5 9 5 9 WWWWWWWWW WBWBWBBBW WBBBWWBWW WBWBWBBBW WWWWWWWWW 1 1 1 1 B 1 1 1 1 W 1 2 1 1 WB 2 1 1 1 W B
输出 #1
1 0 -1 2 2 0 -1 1 1
The first test case is pictured below.
We can take the black cell in row $1$ and column $2$ , and make all cells in its row black. Therefore, the cell in row $1$ and column $4$ will become black.
In the second test case, the cell in row $2$ and column $1$ is already black.
In the third test case, it is impossible to make the cell in row $2$ and column $2$ black.
The fourth test case is pictured below.
We can take the black cell in row $2$ and column $2$ and make its column black.
Then, we can take the black cell in row $1$ and column $2$ and make its row black.
Therefore, the cell in row $1$ and column $1$ will become black.
We can take the black cell in row $1$ and column $2$ , and make all cells in its row black. Therefore, the cell in row $1$ and column $4$ will become black.
In the second test case, the cell in row $2$ and column $1$ is already black.
In the third test case, it is impossible to make the cell in row $2$ and column $2$ black.
The fourth test case is pictured below.
We can take the black cell in row $2$ and column $2$ and make its column black.
Then, we can take the black cell in row $1$ and column $2$ and make its row black.
Therefore, the cell in row $1$ and column $1$ will become black.
C++ 编辑器
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评测结果：Accepted