Compilare: main.cpp: In function 'int f(int)': main.cpp:16:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for (int i = 0, j = 0; j < a.size(); j++) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:9: warning: unused variable 's' [-Wunused-variable] 44 | int s = v[1], l = 1; | ^