Compilare: main.cpp: In function 'void down(std::vector<std::pair<int, int> >&, int, std::vector<int>&)': main.cpp:33:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | if (child1 < heap.size() && heap[child1].first < heap[indx].first) | ~~~~~~~^~~~~~~~~~~~~ main.cpp:40:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | if (child2 < heap.size() && heap[child2].first < heap[indx].first) | ~~~~~~~^~~~~~~~~~~~~