HDU_1176_DP

http://acm.hdu.edu.cn/showproblem.php?pid=1176

 

简单dp，转换后跟上一题数塔一样，注意每秒只能移动一格，还有在边缘的情况。

 

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;

int a[100005][12];

int maxx(int x,int y,int z)
{
    int temp = max(x,y);
    return max(temp,z);
}

int main()
{
    int n;
    while(scanf("%d",&n) && n)
    {
        memset(a,0,sizeof(a)); 
        int time = 0;
        while(n--)
        {
            int t,x;
            scanf("%d%d",&x,&t);
            time = max(time,t);
            a[t][x]++;
        }
        for(int i = time-1;i >= 0;i--)
        {
            for(int j = 1;j < 10;j++)    a[i][j] += maxx(a[i+1][j],a[i+1][j-1],a[i+1][j+1]);
            a[i][0] += max(a[i+1][0],a[i+1][1]);
            a[i][10] += max(a[i+1][10],a[i+1][9]);
        }
        printf("%d\n",a[0][5]);
    }
    return 0;
    
}