Compilare: main.cpp: In function 'std::vector<std::pair<long long int, long long int> > solve(long long int)': main.cpp:49:50: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 49 | for (int i = 1; i <= len / 2 && v.size() < (int)k.size() ; i++) { | ~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:63:22: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 63 | if (v.size() < (int)k.size() ) | ~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:83:35: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 83 | for (int j = i + 1; j < k.size(); j++) { | ~~^~~~~~~~~~