Compilare: main.cpp: In function 'int main()': main.cpp:59:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for (i=0; i<L[nod1].size(); i++) | ~^~~~~~~~~~~~~~~ main.cpp:66:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (i=0; i<L[nod2].size(); i++) | ~^~~~~~~~~~~~~~~