算法 | deadend



算法 | deadend

原题：hihoCoder 1078 : 线段树的区间修改

题意

给定n个商品及其初始价格，存在两种操作：

  • 修改价格：修改区间[l, r]内的价格为新价格np
  • 查询价格：查询区间[l, r]内的总价格

题目中所有价格均大于0。

思路

线段树、区间更新。线段树每个节点维护一个标志位，实现其子节点的延迟更新，从而避免每次都更新操作都要对所涉及的节点全部更新一遍。


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