本文主要是介绍LCIS --线段树区间合并，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
所谓线段树区间合并就是在查询的时候对线段树的孩子进行合并，合并成一段区间进行操作的合并
Time Limit: 6000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 3785 Accepted Submission(s): 1712
Problem Description
Given n integers.
You have two operations:
U A B: replace the Ath number by B. (index counting from 0)
You have two operations:
U A B: replace the Ath number by B. (index counting from 0)
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