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  1. #include<stdio.h>
  2. int M[15][15];
  3. void toggle(int x, int y) {for (int i = 0; i <= x; i++)for (int j = 0; j <= y; j++)M[i][j] = !M[i][j];}
  4. int main() {
  5. 	int n, ans = 0;
  6. 	scanf("%d", &n);
  7. 	for (int i = 0; i < n; i++)for (int j = 0; j < n; j++)scanf("%1d", &M[i][j]);
  8. 	for (int i = n - 1; i >= 0; i--)for (int j = n - 1; j >= 0; j--)if (M[i][j])toggle(i, j),ans++;
  9. 	printf("%d", ans);
  10. 	return 0;
  11. }
Success #stdin #stdout 0s 4520KB
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https://ideone.com/tE5oVB
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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