Compilare: user.cpp: In function ‘void solve()’: user.cpp:40:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<g[i].size();j++) ^ user.cpp:49:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ag[i].size()>m) m=ag[i].size(),nr=i; ^ user.cpp:53:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[nr].size();i++) ^ user.cpp:57:48: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<min(nr,nr1)<<" "<<max(nr,nr1); ^