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  <title>树状数组简单梳理（上）</title>
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  <author>coldheart</author>
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  <description><![CDATA[树状数组简单梳理（上） 背景 平时做题时我们经常会碰到一类问题： 有一个数组，多次往这个数组上某个点的值增加k，再多次求数组上某个区间所有数组之和]]></description>
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