Compilare: user.cpp: In function ‘int main()’: user.cpp:56:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (a[i][j] == a[i + 1][j] + 1 || a[i][j] == a[i + 1][j] - 1 || b[i][j] == b[i + 1][j] + 1 || b[i][j] == b[i + 1][j] - 1) ^ user.cpp:15:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.in","r",stdin); ^ user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.out","w",stdout); ^ user.cpp:19:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n", &x, &y, &n, &q); ^ user.cpp:30:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &d); ^