Compilare: user.cpp: In function ‘int main()’: user.cpp:17:136: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aladdin2.in","r",stdin),freopen("aladdin2.out","w",stdout),scanf("%d%d",&n,&m),a[1]=c[1]=2,a[0]=c[0]=b[0]=d[0]=b[1]=d[1]=1; ^ user.cpp:17:136: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:17:136: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]