50pts求助

P1434 [SHOI2002] 滑雪

dongrunxuan @ 2023-10-28 17:21:21

第52行的-1,不加过5个点,加了过另外5个点 代码如下


#include<bits/stdc++.h>
using namespace std;
const int maxn=105;
int r,c,ans=1;
int a[maxn][maxn],f[maxn][maxn];
int dfs(int i,int j)
{
    if(f[i][j]!=0)
    {
        return f[i][j];
    }
    else
    {
        f[i][j]=1;
        if(a[i+1][j]<a[i][j])
        { 
            f[i][j]=max(f[i][j],1+dfs(i+1,j));
        }
        if(a[i-1][j]<a[i][j])
        { 
            f[i][j]=max(f[i][j],1+dfs(i-1,j));
        }
        if(a[i][j-1]<a[i][j])
        { 
            f[i][j]=max(f[i][j],1+dfs(i,j-1));
        }
        if(a[i][j+1]<a[i][j])
        { 
            f[i][j]=max(f[i][j],1+dfs(i,j+1));
        }
    }
    return f[i][j];
}
int main()
{
    cin>>r>>c;
    for(int i=1;i<=r;i++)
    {
        for(int j=1;j<=c;j++)
        {
            cin>>a[i][j];
        }
    }
    for(int i=1;i<=r;i++)
    {
        for(int j=1;j<=c;j++)
        {
            dfs(i,j);
            ans=max(ans,f[i][j]);
        }
    }
    cout<<ans-1;
    return 0;
}```

by zjpwdyf @ 2023-10-28 18:16:57

dfs中的i,j可能会越界


by dongrunxuan @ 2023-10-28 19:24:02

@zjpwdyf 好的,谢谢


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