Compilare: main.cpp: In function 'bool solve(int)': main.cpp:97:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 97 | for(int i = 0; i < v.size(); i++){ | ~~^~~~~~~~~~ main.cpp:103:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for(int i = 0; i < val2.size(); i++){ | ~~^~~~~~~~~~~~~