Compilare: user.cpp: In function ‘int main()’: user.cpp:19:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(j < m) if(a[i][j] < a[i][j + 1]) f[i * 2 - 1][j * 2] = 0; ^ user.cpp:21:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i < n) if(a[i][j] < a[i + 1][j]) f[i * 2][j * 2 - 1] = 0; ^ user.cpp:10:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("jmenoasa.in", "r", stdin); ^ user.cpp:11:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("jmenoasa.out", "w", stdout); ^ user.cpp:12:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:15:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^