```cpp
#include<bits/stdc++.h>
using namespace std;
int mp[105][105],vis[101][101],n,m,ans=0;
int dx[]={-1,1,0,0}, dy[]={0,0,-1,1};
int dfs(int x,int y,int maxfrom)
{
int sum=0;
if(mp[x][y]>=maxfrom) return 0;
if(mp[x][y]==1) return 1;
for(int i=0;i<4;i++)
{
int nx=x+dx[i];
int ny=y+dy[i];
if(nx>n||nx<=0||ny>m||ny<=0) continue;
if(vis[nx][ny]==0)
{
vis[nx][ny]=1;
sum=max(sum,dfs(nx,ny,mp[x][y]));
vis[nx][ny]=0;
}
}
return sum+1;
}
int main()
{
cin>>n>>m;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
cin>>mp[i][j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
vis[i][j]=1;
ans=max(ans,dfs(i,j,0x7f));
vis[i][j]=0;
}
cout<<ans;
return 0;
}
```
输入有问题改后70pts
by 2011Andy @ 2023-09-02 15:22:17
@[ytr2010](/user/672044) 你没记忆化啊（
by lraM416 @ 2023-09-02 15:31:09