Compilare: main.cpp: In function 'int main()': main.cpp:168:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 168 | for(int i=0; i<rez.size(); i++) | ~^~~~~~~~~~~ main.cpp:173:18: warning: unused variable 'x' [-Wunused-variable] 173 | for(auto x : s) | ^