Compilare: main.cpp: In function 'int main()': main.cpp:56:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(int i=1;i<vals.size();i++) | ~^~~~~~~~~~~~ main.cpp:84:14: warning: variable 'ok' set but not used [-Wunused-but-set-variable] 84 | bool ok=0; | ^~