Compilare: user.cpp: In function ‘void minheap(std::vector<std::pair<int, int> >&, int)’: user.cpp:32:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((2*i+1)<v.size()) { ^ user.cpp:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((2*i+2)==v.size()) { ^ user.cpp: In member function ‘void graf::apm(char*, const graf&)’: user.cpp:100:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<a[i].size();j++) ^ user.cpp:108:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<h.size();i++) cout<<h[i].first<<"-"<<h[i].second<<" "; ^ user.cpp:112:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<h.size();i++) cout<<h[i].first<<"-"<<h[i].second<<" "; ^ user.cpp:114:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<a[u].size();i++) ^ user.cpp:94:11: warning: unused variable ‘min’ [-Wunused-variable] int u,min; ^ user.cpp: In function ‘int main()’: user.cpp:154:22: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] x.apm("apm.out",x); ^