Compilare: user.cpp: In function ‘int main()’: user.cpp:43:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<points.size()-1;++i) ^ user.cpp:44:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<points.size();++j) ^ user.cpp:52:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<pant.size();++i) ^ user.cpp:32:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trapez.in","r",stdin); ^ user.cpp:33:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trapez.out","w",stdout); ^ user.cpp:36:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:39:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&P.x,&P.y); ^