题目大意

你有一个序列${a_i}$,你要找出$k$个不相同的区间$[l_i,r_i]$,满足$\forall \; i, (r_i-l_i+1) \in [L, R]$,使得这些区间的和最大。

求这个最大值

zcy会写树剖啦!

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