Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:30:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for (int i=0;i<l[nod].size();i++) { | ~^~~~~~~~~~~~~~ main.cpp: In function 'void sterge(int)': main.cpp:66:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (int i=0;i<l[nod].size();i++) { | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:99:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem2>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for (int i=0;i<a.size();i++) | ~^~~~~~~~~