Compilare: user.cpp: In function ‘int bfs()’: user.cpp:24:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i){ ^ user.cpp: In function ‘void ad1(int)’: user.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[s].size();++i){ ^ user.cpp: In function ‘void ad2(int)’: user.cpp:46:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[s].size();++i){ ^ user.cpp: In function ‘int main()’: user.cpp:66:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[n].size();++i){ ^ user.cpp:86:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V.size();++i){ ^ user.cpp:87:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(ver1[V[i].first] && ver2[V[i].second] || ver1[V[i].second] && ver2[V[i].first]) ^ user.cpp:91:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();++i) ^