Compilare: main.cpp: In member function 'void MinHeap::heapify_down(int)': main.cpp:33:22: 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 (left < heap.size() && heap[left].x < heap[smallest].x) | ~~~~~^~~~~~~~~~~~~ main.cpp:35:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | if (right < heap.size() && heap[right].x < heap[smallest].x) | ~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:103:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | if (pos[s] < a[s].size()) { | ~~~~~~~^~~~~~~~~~~~~