Compilare: user.cpp: In function ‘int main()’: user.cpp:64:28: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s2>smin || s2==smin && k2<kmin) ^ user.cpp:70:28: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s3>smin || s3==smin && k3<kmin) ^ user.cpp:76:28: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s4>smin || s4==smin && k4<kmin) ^ user.cpp:8:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cri.in","r",stdin); ^ user.cpp:9:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cri.out","w",stdout); ^ user.cpp:13:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m,&x,&y); ^ user.cpp:17:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^