Compilare: user.cpp: In function ‘uint64 query(int, int, int, int, int)’: user.cpp:95:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (qleft <= mid) ret += query(node * 2, left, mid, qleft, qright); ^ user.cpp:96:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (qright > mid) ret += query(node * 2 + 1, mid + 1, right, qleft, qright); ^