Compilare: main.cpp: In function 'void down(int)': main.cpp:24:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int index = startIndex, childIndex = index << 1; childIndex < heap.size();) ~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:29:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (childIndex + 1 < heap.size() && v[heap[index]] > v[heap[childIndex + 1]]) ~~~~~~~~~~~~~~~^~~~~~~~~~~~~