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Codeforces Round #618 (Div. 1) C. Water Balance(思维+单调栈)
阅读量:393 次
发布时间:2019-03-05

本文共 478 字,大约阅读时间需要 1 分钟。

在这里插入图片描述
在这里插入图片描述
题意:给出n个数,每次可以选任意区间,把这个区间的所有数都变成平均数,问怎么变能使得整个数组的字典序最小。。
思路:很明显,我们要先字典序最小的话首先要想办法把前面大的数给降下来,就是通过后面小的数一平均就可以降下来了,我们可以从后往前遍历,每次把变成平均数的那一段看成一个整体,维护一下就行。size存的是从当前为开始作为一整体的区间下标,意思也就是比如i=3和j=6是一个整体,那么size【i】和size【j】的下标都是6,也是为了优化时间复杂度。。。

#include
using namespace std;const int N=1e6+10;int n;double a[N],size[N];int main(){ scanf("%d",&n); for(int i=1;i<=n;++i) scanf("%lf",&a[i]),size[i]=i; a[n+1]=N; for(int i=n;i>=1;--i) { double sum=a[i],cnt=1; int j=i+1; while(a[j]

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