2011百度之星 复赛（下）第一题

// BDFS2_1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
using namespace std;
#define MAX 1000005
#define min(x,y) ((x)<(y)?(x):(y))
#define INF 99999999
int h[MAX];
int n;
//bool couldJump[MAX][MAX];
int dp[MAX];//d第0点往j点跳
bool couldJump(int x,int y){
	
	if(y<=x)return false;
	for(int i=x+1;i<y;i++){
		if(h[i]>=h[x]&&h[i]>=h[y])return false;
	}
	
	if(y-x>h[x])return false;
	
	
	return true;
}
int main(int argc, char* argv[])
{
	freopen("i://input.txt","r",stdin);
	int i,j;
	
	scanf("%d",&n);
	for(i=0;i<n+1;i++)
		scanf("%d",h+i);

		dp[0]=0;
		for(j=1;j<=n;j++){
			
			dp[j]=INF;
		}
		for(i=1;i<=n;i++){
			
			for(int j=i-1;j>=0;j--){
				
				if(couldJump(j,i)){
					
					int ti = 0;
					if(h[j]<=h[i])ti=h[i]-h[j];
			
					if(dp[j]+ti<dp[i])
						dp[i]=dp[j]+ti;
			
				}
				
			}
			
		}
		printf("%d\n",dp[n]);
		return 0;
}