题目链接：https://nanti.jisuanke.com/t/31460
Ryuji is not a good student, and he doesn't want to study. But there are n books he should learn, each book has its knowledge $a[i]$.Ryuji
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计蒜客 31460 - Ryuji doesn't want to study - [线段树][2018ICPC徐州网络预赛H题]
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