Compilare: main.cpp: In function 'std::vector<long long int> solution(std::vector<long long int>)': main.cpp:18:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for( int i = 0; i < v.size(); ++i ) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for( i = 0; i < a.size(); ++i ) { | ~~^~~~~~~~~~