Compilare: main.cpp: In function 'void DFS(int)': main.cpp:20:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for (int i = 0; i < v[start].size(); i++) | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:27: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 45 | if(2 * pereche.size() == 2 * X - 2) | ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~