Compilare: main.cpp: In function 'int extract_max(std::vector<int>&)': main.cpp:29:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | while (2 * i + 1 < heap.size()) { | ~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:33:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | if (r < heap.size() && heap[r] > heap[l]) { | ~~^~~~~~~~~~~~~