Compilare: main.cpp: In function 'void siftDown(int)': main.cpp:23:82: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int index = startIndex, leftChildIndex = startIndex << 1; leftChildIndex < heap.size(); leftChildIndex = index << 1) ~~~~~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:28:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (leftChildIndex + 1 < heap.size() && heap[index] > heap[leftChildIndex + 1]) ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~