Compilare: user.cpp: In function ‘void Solve()’: user.cpp:68:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k+1<Sol.size();k++) ^ user.cpp:94:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i+1<Sol.size();i++) ^ user.cpp: In function ‘void Read()’: user.cpp:14:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:16:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf",&Point[i].first,&Point[i].second); ^ user.cpp: In function ‘int main()’: user.cpp:104:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("camera.in","r",stdin); ^ user.cpp:105:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("camera.out","w",stdout); ^