萌新求调qaq

#include <bits/stdc++.h>
using namespace std;
char mp[105][105];
bool dfs(int,int);
int n,m;
int vis(int x,int y)
{
    mp[x][y]='0';
    dfs(x,y);
}
bool dfs(int x,int y)
{
    if(x==n&&y==m)
    {
        return true;
    }
    else if(mp[x][y-1]=='.')
    {
        vis(x,y-1);
    }
    else if(mp[x][y+1]=='.')
    {
        vis(x,y+1);
    }
    else if(mp[x-1][y]=='.')
    {
        vis(x-1,y);
    }
    else if(mp[x+1][y]=='.')
    {
        vis(x+1,y);
    }
    else
    {
        return false;
    }
}
int main()
{
    cin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            cin>>mp[i][j];
        }
    }

    if(dfs(1,1))
    {
        printf("Yes");
    }
    else
    {
        printf("No");
    }
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            cout<<mp[i][j];
        }
        cout<<endl;
    }
    return 0;
}