hoj1058 Number Triangles

http://acm.hit.edu.cn/hoj/problem/view?id=1058

简单的dp

/*This Code is Submitted by billforum for Problem 4000103 at 2012-02-01 18:08:39*/
#include <iostream>

using namespace std;
int d[1001][1001];

int max(int x,int y)
{
        return (x>y?x:y);
}
int main(int args,char** argv)
{
        int n;
        int tmp1,ans,tmp2;
        while(cin>>n)
        {
                 ans=0;
                for(int i=0;i<n;i++)
                        for(int j=0;j<=i;j++)
                        {
                                cin>>d[i][j];
                        }
                for(int s=1;s<n;s++)
                {
                        for(int t=0;t<=s;t++)
                        {
                                if(t>=1) tmp1=d[s-1][t-1];
                                else tmp1=0;
                                if(s-1>=t) tmp2=d[s-1][t];
                                else tmp2=0;
                                d[s][t]=d[s][t]+max(tmp2,tmp1);
                        }
                }
                for(int j=0;j<n;j++)
                        if(d[n-1][j]>ans) ans=d[n-1][j];
                        cout<<ans<<endl;
        }
        return 0;
}