Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int j=0;j<L[x].size();j++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(j=0;j<sol.size();j++) | ~^~~~~~~~~~~