Compilare: main.cpp: In function 'std::vector<int> solve(std::vector<int>, std::vector<int>)': main.cpp:8:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 8 | for(int i=0; i<a.size(); i++) | ~^~~~~~~~~ main.cpp:9:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 9 | for(int j=i+1;j<a.size(); j++){ | ~^~~~~~~~~