Compilare: main.cpp: In function 'int main()': main.cpp:99:23: warning: comparison of integer expressions of different signedness: 'std::priority_queue<Passenger, std::vector<Passenger>, std::greater<void> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 99 | if (heap.size() <= capacity[1]) | ~~~~~~~~~~~~^~~~~~~~~~~~~~