Compilare: main.cpp: In function 'void solve(int, std::vector<std::vector<int> >&, std::vector<int>&)': main.cpp:13:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (int i = 0; i < master[node].size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:40:38: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 40 | if (master[i].size() > k) | ~~~~~~~~~~~~~~~~~^~~