Compilare: main.cpp: In function 'void back()': main.cpp:35:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int i = 0; i < K.size(); i++){ | ~~^~~~~~~~~~ main.cpp:45:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for(int i = 0; i < sol.size(); i++){ | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | for(int i = 0; i < K.size(); i++) | ~~^~~~~~~~~~ main.cpp:89:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 89 | for(int i = 0; i < final_moves.size(); i++){ | ~~^~~~~~~~~~~~~~~~~~~~