Main.cpp: In function 'void add(std::string, int)':
Main.cpp:9:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
9 | for(int i=0;i<s.size();i++){
| ~^~~~~~~~~
Main.cpp: In function 'bool dfs(int, int)':
Main.cpp:25:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
25 | for(int i=0;i<V[u].size();i++){
| ~^~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:44:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
44 | for(int i=0;i<V[0].size();i++) x|=dfs(V[0][i],0);
| ~^~~~~~~~~~~~