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56 lines
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2 years ago
#include <bits/stdc++.h>
/**
3 4
P P P P
P O P X
P O X P
O P P P
10
*/
using namespace std;
const int N = 110;
char a[N][N];
struct Node {
int x;
int y;
int step;
};
queue<Node> q;
int dx[] = {0, 0, -1, 1};
int dy[] = {-1, 1, 0, 0};
int cnt;
int main() {
int n, m;
cin >> n >> m;
for (int i = 1; i <= m; i++)
for (int j = 1; j <= m; j++) {
cin >> a[i][j];
//记录初始病人
if (a[i][j] == 'X') q.push({i, j, 0});
}
//n分钟
while (!q.empty()) {
auto t = q.front();
q.pop();
//执行n分钟
if (t.step == n) break;
//四个方向
for (int i = 0; i <= 3; i++) {
int tx = t.x + dx[i];
int ty = t.y + dy[i];
if (tx >= 1 && tx <= m && ty >= 1
&& ty <= m && a[tx][ty] == 'P') {
a[tx][ty] = 'X';
q.push({tx, ty, t.step + 1});
}
}
}
for (int i = 1; i <= m; i++)
for (int j = 1; j <= m; j++)
if (a[i][j] == 'X')cnt++;
printf("%d ", cnt);
return 0;
}