Compilare: user.cpp: In function ‘void infasuratoare(std::vector<std::pair<int, int> >&)’: user.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<P.size();j++) ^ user.cpp:24:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=2;j<P.size();j++) ^ user.cpp: In function ‘int next(std::vector<std::pair<int, int> >&, int)’: user.cpp:32:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] { return ((c!=P.size()-1) ? c+1 : 0);} ^ user.cpp: In function ‘int main()’: user.cpp:60:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cp==P.size()-1) break; ^ user.cpp:49:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("oypara.in","r",stdin); ^ user.cpp:51:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:53:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d%d%d",&u,&v,&w); P.pb(mp(u,v)); Q.pb(mp(u,w));} ^ user.cpp:63:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oypara.out","w",stdout); ^