Compilare: main.cpp: In function 'int main()': main.cpp:116:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 116 | for (int i = 0; i < a.size(); i++) { | ~~^~~~~~~~~~ main.cpp:89:10: warning: variable 'ok' set but not used [-Wunused-but-set-variable] 89 | bool ok = 1; | ^~