zoukankan
html css js c++ java
51Nod1545
思路
求区间和，应该是模板题，但是我直接套了之前的模板，输出有的不对，有的为负数。板子也忘得差不多了，明天复习一下再补
反正我第一反应永远不是最简单的办法，是线段树。本题用前缀和写最快。
前缀和
树状数组
线段树
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原文地址：https://www.cnblogs.com/OFSHK/p/14737210.html
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