Compilare: main.cpp: In function 'int main()': main.cpp:40:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for (i = 0; i < vec[father[b]].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:53:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for (i = 0; i < vec[j].size(); ++i) | ~~^~~~~~~~~~~~~~~