Wednesday, April 17, 2024

# Codeforces Round #385 (Div. 2), problem: (B) Hongcow Solves A Puzzle Solution in C/C++

```#include <limits.h>
#include <stdio.h>

int main() {
int i, j, n, m, cnt, imin, jmin, imax, jmax;
static char cc[500][501];

scanf("%d%d", &n, &m);
for (i = 0; i < n; i++)
scanf("%s", cc[i]);
imin = jmin = INT_MAX;
imax = jmax = 0;
cnt = 0;
for (i = 0; i < n; i++)
for (j = 0; j < m; j++)
if (cc[i][j] == 'X') {
cnt++;
if (imin > i)
imin = i;
if (imax < i)
imax = i;
if (jmin > j)
jmin = j;
if (jmax < j)
jmax = j;
}
printf("%s\n", (imax - imin + 1) * (jmax - jmin + 1) != cnt ? "NO" : "YES");
return 0;
}
```

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