Compilare: main.cpp: In function 'void bkt(int)': main.cpp:52:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for (int i = 0; i < sol.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:232:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 232 | for (int i = 0; i < sol.size(); ++i) | ~~^~~~~~~~~~~~