POJ--1088--dp--滑雪

#include<iostream>
using namespace std;
const static int N = 102;
int map[N][N] = {0};
int mar[N][N] = {0};
int dp(int,int);
int row,col;
int main()
{
    while(cin>>row>>col)
    {
        int i,j;
        int max = 0;
        for(i=1;i<=row;++i)
            for(j=1;j<=col;++j)
                cin>>map[i][j];
        for(i=1;i<=row;++i)
            for(j=1;j<=col;++j)
                {
                    if(mar[i][j] == 0)mar[i][j] = dp(i,j);
                    if(max < mar[i][j])max = mar[i][j];
                }
        cout<<max<<endl;
    }
    return 0;    
}
int dp(int i,int j)
{
    if(mar[i][j] != 0)return mar[i][j];
    int shang=0,xia=0,zuo=0,you=0;
    if(i-1 >= 1 && map[i-1][j]<map[i][j])shang = 1+dp(i-1,j);
    else shang = 1;
    if(i+1 <= row && map[i+1][j]<map[i][j])xia = 1+dp(i+1,j);
    else xia = 1;
    if(j-1 >= 1 && map[i][j-1]<map[i][j])zuo = 1+dp(i,j-1);
    else zuo = 1;
    if(j+1 <= col && map[i][j+1]<map[i][j])you = 1+dp(i,j+1);
    else you = 1;
    shang = shang > xia?shang:xia;
    shang = shang > zuo?shang:zuo;
    shang = shang > you?shang:you;
    return shang;
}