Compilare: main.cpp: In function 'int main()': main.cpp:29:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for (i = 0; i < vec.size(); i++) | ~~^~~~~~~~~~~~ main.cpp:30:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for (j = 0; j < vec.size(); j++) | ~~^~~~~~~~~~~~ main.cpp:55:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for (i = 1; i < sol.size(); i++) | ~~^~~~~~~~~~~~