Compilare: user.cpp: In function ‘int main()’: user.cpp:5:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("culori3.in","r",stdin); ^ user.cpp:6:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("culori3.out","w",stdout); ^ user.cpp:8:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:7:23: warning: ‘nc’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,i,j,x,p1,p2,nc; ^ user.cpp:7:17: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,i,j,x,p1,p2,nc; ^