```cpp
#include<bits/stdc++.h>
using namespace std;
const int N=2e2+2;
int dx[5]={0,0,0,1,-1};
int dy[5]={0,1,-1,0,0};
int n,m,a[N][N],s[N][N],cnt;
bool vis[N][N];
int dfs(int x,int y){
if(s[x][y])return s[x][y];
s[x][y]=1;
for(int i=1;i<=4;i++){
int xx=dx[i]+x;
int yy=dy[i]+y;
if(xx>0&&yy>0&&xx<=n&&yy<=m&&a[x][y]>a[xx][yy]){
dfs(xx,yy);
s[x][y]=max(s[x][y],s[xx][yy]+1);
}
}
return s[x][y];
}
int main() {
ios::sync_with_stdio(false);
cin>>n>>m;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++) // here
cin>>a[i][j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
cnt=max(cnt,dfs(i,j));
cout<<cnt;
return 0;
}
```
by XuYueming @ 2023-11-27 18:05:27
@[ljhtomorrow](/user/1023285) 输入的循环写错了
by XuYueming @ 2023-11-27 18:05:54
@[XuYueming](/user/728079) 歇歇我没脑汁awa
by ljhtomorrow @ 2023-11-27 18:07:27
@[ljhtomorrow](/user/1023285) 6
by 2022_37_yzyUUU @ 2023-11-28 17:41:14
@[2022_37_yzyUU](/user/785636) sss
by ljhtomorrow @ 2023-11-28 18:00:31