poj 2313 Sequence 贪心

#include <iostream>
using namespace std;
int n;
int a[128],b[128];

int main()
{
	scanf("%d",&n);
	for(int i=0;i<n;++i)
		scanf("%d",&a[i]);
	b[0]=a[0];
	for(int i=1;i<n-1;++i){
		if(a[i]>b[i-1]&&a[i]>a[i+1])
			b[i]=max(b[i-1],a[i+1]);
		else if(a[i]<b[i-1]&&a[i]<a[i+1])
			b[i]=min(b[i-1],a[i+1]);
		else 
			b[i]=a[i];
	}
	b[n-1]=a[n-1];
	int ans=0;
	for(int i=0;i<n;++i){
		ans+=abs(a[i]-b[i]);
		if(i)
			ans+=abs(b[i]-b[i-1]);
	}
	printf("%d",ans);
	return 0;	
} 

poj 2313 Sequence 贪心

原文：http://blog.csdn.net/sepnine/article/details/46125691