#include<iostream>
using namespace std;
int inputsz[100][100];
int R,C;    
int resulesz[100][100];
int Maxnumber(int x,int y)
{
    if (resulesz[x][y]>0)
    {
        return resulesz[x][y];
    }
    int Max=0;
    if (x-1>=1&&inputsz[x][y]>inputsz[x-1][y])
    {
        if (Maxnumber(x-1,y)>Max)
        {
            Max=Maxnumber(x-1,y);
        }
    }
    if (x+1<=R&&inputsz[x][y]>inputsz[x+1][y])
    {
        if (Maxnumber(x+1,y)>Max)
        {
            Max=Maxnumber(x+1,y);
        }
    }
    if (y-1>=1&&inputsz[x][y]>inputsz[x][y-1])
    {
        if (Maxnumber(x,y-1)>Max)
        {
            Max=Maxnumber(x,y-1);
        }
    }
    if (y+1<=C&&inputsz[x][y]>inputsz[x][y+1])
    {
        if (Maxnumber(x,y+1)>Max)
        {
            Max=Maxnumber(x,y+1);
        }
    }
    resulesz[x][y]=Max+1;
    return Max+1;
}
int main()
{    
    cin>>R>>C   ;        
        for(int i=0;i<100;i++)
        {
              for (int j=0;j<100;j++)
              {
                  inputsz[i][j]=0;
                  resulesz[i][j]=0;
              }
        }
        for (int i=1;i<=R;i++)
        {
            for (int j=1;j<=C;j++)
            {
                cin>>inputsz[i][j];
            }
        }
        int maxbz=0;
        for (int i=1;i<=R;i++)
        {
            for (int j=1;j<=C;j++)
            {                
                if (Maxnumber(i,j)>maxbz)
                {
                    maxbz=Maxnumber(i,j);                      
                }                
            }
        }
        cout<<maxbz;   
    return 0;
}
这个会RE  impossible啊!....