Turing Tree HDU - 3333 (树状数组，离线求区间元素种类数)

After inventing Turing Tree, 3xian always felt boring when solving problems about intervals, because Turing Tree could easily have the solution. As well, wily 3xian made lots of new problems about intervals. So, today, this sick thing happens again...After inventing Turing Tree, 3xian always felt b