Compilare: user.cpp: In function ‘int apm(int)’: user.cpp:50:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[i].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:75:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L.size();i++) ^ user.cpp: In function ‘int apm(int)’: user.cpp:62:29: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized] L.push_back({p1, p2}); ^ user.cpp:63:18: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] viz[p1]=1; ^