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  1. #include<bits/stdc++.h>
  2. #define int long long
  3. using namespace std;
  4. int cha[1001][1001];
  5. char a[1001][1001];
  6. int dx[4]={-1,1,0,0};
  7. int dy[4]={0,0,-1,1};
  8. char huong[4]={'U','D','L','R'};
  9. int n,m,a1,a2;
  10. string cc="";
  11. signed main()
  12. {
  13.  
  14.     queue<pair<int,int>>q;
  15.     cin>>n>>m;
  16.     for (int i=1;i<=n;i++)
  17.     {
  18.         for (int j=1;j<=m;j++)
  19.         {
  20.             cin>>a[i][j];
  21.             if (a[i][j]=='M')
  22.             {
  23.                 q.push({i,j});
  24.             }
  25.             else if (a[i][j]=='A')
  26.             {
  27.                 a1=i;
  28.                 a2=j;
  29.             }
  30.         }
  31.     }
  32.     q.push({a1,a2});
  33.     while (!q.empty())
  34.     {
  35.         int x=q.front().first;
  36.         int y=q.front().second;
  37.         q.pop();
  38.         if (a[x][y]=='A'&&(x==1||x==n||y==1||y==m))
  39.         {
  40.             cout<<"YES"<<"\n";
  41.             while (x!=a1||y!=a2)
  42.             {
  43.                 int k=cha[x][y];
  44.                 cc=huong[k]+cc;
  45.                 x=x-dx[k];
  46.                 y=y-dy[k];
  47.             }
  48.             cout<<cc.size()<<"\n";
  49.             cout<<cc;
  50.             return 0;
  51.         }
  52.         for (int i=0;i<4;i++)
  53.         {
  54.             int xx=x+dx[i];
  55.             int yy=y+dy[i];
  56.             if (xx>=1&&xx<=n&&yy>=1&&yy<=m&&a[xx][yy]=='.')
  57.             {
  58.                 a[xx][yy]=a[x][y];
  59.                 if (a[xx][yy]=='A') cha[xx][yy]=i;
  60.                 q.push({xx,yy});
  61.             }
  62.         }
  63.     }
  64.     cout<<"NO";
  65.     return 0;
  66. }
  67.  
Success #stdin #stdout 0s 5304KB
comments (?)
stdin 
Standard input is empty
stdout 
NO
https://ideone.com/OfaydF
language:
C++14 (clang 8.0)
created:
289 days ago
visibility:
secret

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