相关链接
题目传送门:http://acm.hdu.edu.cn/showproblem.php?pid=5575
神犇题解:http://blog.csdn.net/qq_19592437/article/details/50252111
中文题面:https://ly.men.ci/problem/199
解题报告
这题我们可以用左偏树+并查集什么的
不过感觉分治更好写吧?
考虑$solve(l,r)$表示区间$(l,r]$的最优解
那么找出其中最高的挡板设为$x$,之后分两种情况讨论
- 区间水位低于$x$,那么我们分治$solve(l,x-1)+solve(x+1,r)$即可
- 区间水位高于$x$,那么我们搞一个前缀和就好
总的时间复杂度:$O(n \log n)$
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