（线段树统计区间种数）Count Color

Count Color Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 54359   Accepted: 16337 Description Chosen Problem Solving and Program design as an optional course, you are required to solve all kinds of problems. Here, we get a new problem.  There is a very long board with length L centimeter, L is a positive integer, so we can evenly divide the board into L segments, and they are labeled by 1, 2, ... L from left to right, each is 1 centimeter long. Now we have to color the board - one segment with only one color. We can do following two operations on the board:  1. "C A B C" Color the board from segment A to segment B with color C.  2. "P A B" Output the number of different colors painted between segment A and segment B (including).  In our daily life, we have very few words to describe a color (red, green, blue, yellow…), so you may assume that the total number of different colors T i