Compilare: main.cpp: In function 'void back(int)': main.cpp:18:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i = 0; i < moves.size(); i++){ | ~~^~~~~~~~~~~~~~ main.cpp:26:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(int i = 0; i < sol.size(); i++){ | ~~^~~~~~~~~~~~