Compilare: main.cpp: In function 'int main()': main.cpp:143:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 143 | for (i=0;i<a.size();i++) | ~^~~~~~~~~ main.cpp:144:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 144 | for (int j=i+1;j<a.size();j++) | ~^~~~~~~~~ main.cpp:142:15: warning: unused variable 'vf' [-Wunused-variable] 142 | int vf=0; | ^~