@洛谷 @kkksc03 P1115那道题其实有O(n)O(n)O(n)的算法,可以参照P1020,开一个SPJ,O(nlogn)100ptsO(n\log n)100ptsO(nlogn)100pts,O(n)200ptsO(n)200ptsO(n)200pts