Compilare: main.cpp: In function 'void dfs(int)': main.cpp:5:124: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 5 | void dfs(int a){vector<bool> mex(vecini[a].size() + 2,false); for(auto &it : vecini[a]){ if(g[it] == -1) dfs(it); if(g[it] < vecini[a].size()) mex[g[it]] = 1; } for(int i = 0 ; i <= vecini[a].size() ; i++){if(!mex[i]){g[a] = i; break;}}} main.cpp:5:180: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 5 | void dfs(int a){vector<bool> mex(vecini[a].size() + 2,false); for(auto &it : vecini[a]){ if(g[it] == -1) dfs(it); if(g[it] < vecini[a].size()) mex[g[it]] = 1; } for(int i = 0 ; i <= vecini[a].size() ; i++){if(!mex[i]){g[a] = i; break;}}} | ~~^~~~~~~~~~~~~~~~~~~