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知识点学习:Oi-Wiki 前缀和&差分
题目意思本质为：一维正半轴上给nnn条线段。每个整点iii有一个值viv_ivi，大小根据iii点覆盖的线段个数covericover_icoveri 来定.
coveri=0,vi=1cover_i = 0 , v_i = 1coveri=0,vi=1
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