一个很好的线段树的题目，每一组数据里面的一个区间是一个不同的颜色，问最后可以看到几种颜色 ....... 要清楚树的是树有多少个节点 .. 代码如下 :-A good segment of the subject tree, each set of data inside an interval is a different color and asked to see the last of several colors to make it clear ....... the tr