动态规划:E - Largest Rectangle in a Histogram(即HDU 1506)
来源:互联网 发布:unity3d spine2d插件 编辑:程序博客网 时间:2024/06/07 11:22
题意就是求出最大矩形的面积。开始觉得好像不需要用DP,然后就直接搞了就T了;然后又优化一下,看看能不能用记忆递归搞定,但是记忆的时候实行不了也以失败告终……后来还是又回到了DP上,感觉这题好像跟DP没关系啊,搞了好久不太会,后面参考了下别人的,才知道向左搜索的时候dpl[i]=dpl[dpl[i]-1]这样做,这就是DP,我好晕……这也叫DP啊!!!真不理解,这不就是一般的解法嘛!!太晕了……刚才和队友们聊天的时候,队友说生活要用DP的思想啊……太神了!
#include<iostream>#include<cstdio>#include<algorithm>#include<cstring>#include<string>#include<cmath>#include<set>#include<vector>#include<stack>#include<ctime>#include<cstdlib>#define mem(a,b) memset(a,b,sizeof(a))typedef long long ll;using namespace std;int h[100005],dpl[100005],dpr[100005];int main(){ int n,i,j; while(scanf("%d",&n)&&n) { for(i=1; i<=n; i++) scanf("%d",&h[i]); for(i=1,j=n; i<=n,j>=1; i++,j--) { dpl[i]=i; dpr[j]=j; while(dpl[i]>1&&h[dpl[i]-1]>=h[i]) dpl[i]=dpl[dpl[i]-1]; while(dpr[j]<n&&h[dpr[j]+1]>=h[j]) dpr[j]=dpr[dpr[j]+1]; } ll m=-1; for(i=1; i<=n; i++) m=max(m,(ll)h[i]*(dpr[i]-dpl[i]+1)); cout<<m<<endl; } return 0;}
- 动态规划:E - Largest Rectangle in a Histogram(即HDU 1506)
- HDU 1506 Largest Rectangle in a Histogram 【动态规划】
- hdu 1506 Largest Rectangle in a Histogram[动态规划]
- HDU 1506 动态规划(DP) Largest Rectangle in a Histogram
- HDU 1506(Largest Rectangle in a Histogram)动态规划
- HDU 1506 Largest Rectangle in a Histogram 动态规划
- HDU 1505 Largest Rectangle in a Histogram && HDU 1506 City Game(动态规划)
- hdu 1506 Largest Rectangle in a Histogram(动态规划,很棒的优化)
- 动态规划-Largest Rectangle in a Histogram- HOJ 1506
- hdoj-1506-Largest Rectangle in a Histogram【动态规划】
- HDU1506--Largest Rectangle in a Histogram (动态规划)
- zoj1985 hdu1506 Largest Rectangle in a Histogram (动态规划)
- hdu 1506 Largest Rectangle in a Histogram
- HDU 1506 Largest Rectangle in a Histogram
- hdu 1506 Largest Rectangle in a Histogram
- hdu 1506 Largest Rectangle in a Histogram
- hdu 1506 Largest Rectangle in a Histogram
- HDU 1506 Largest Rectangle in a Histogram
- JUnit4 学习总结
- java自学笔记之抽象类,接口,对象的多态性,instanceof关键字
- Android adb命令,linux中各种命令
- hdu 2255KM算法模板
- cellpadding与cellspacing的区别
- 动态规划:E - Largest Rectangle in a Histogram(即HDU 1506)
- Java内部类
- 入门HTML之2.16
- 新项目工作日志
- 聚类简介Clustering
- 一年半载
- Python&OpenCV - 读写(read&write)视频(video) 详解 及 代码
- Effective Objective-C 2.0:Item 7: Access Instance Variables
- 网络攻防大赛环境配置