Compilare: main.cpp: In function 'int main()': main.cpp:34:63: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if (P[first_elev] < a || P[first_elev + 1] > b || first_elev == P.size() - 1) out << -1 << '\n'; | ~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:35:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i = first_elev; i <= P.size() && P[i] <= b; i++) { | ~~^~~~~~~~~~~