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  quangminhez • 5:23 p.m. 13 Tháng 12, 2024 • ← chỉnh sửa 10 →

  Hint C++

  ko chép code nha mục đích là tham khảo

  include<bits/stdc++.h>

  using namespace std;
  template<typename... T>
  void see(T&... args) { ((cin >> args), ...);}
  template<typename... T>
  void put(T&&... args) { ((cout << args << " "), ...);}
  template<typename... T>
  void putl(T&&... args) { ((cout << args << " "), ...); cout<<'\n';}

  define error(args...)

  void err(istream_iterator<string> it) {}
  template<typename T, typename... Args>
  void err(istream_iterator<string> it, T a, Args... args) {cerr << *it << "=" << a << ", "; err(++it, args...);}

  define int long long

  define pb push_back

  define F first

  define S second

  define ll long long

  define ull unsigned long long

  define ld long double

  define pii pair<int,int>

  define vi vector<int>

  define vii vector<pii>

  define vc vector

  define L cout<<'\n';

  define E cerr<<'\n';

  define all(x) x.begin(),x.end()

  define rep(i,a,b) for (int i=a; i<b; ++i)

  define rev(i,a,b) for (int i=a; i>b; --i)

  define IOS ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);

  define setpr(x) cout<<setprecision(x)<<fixed

  define sz size()

  define seea(a,x,y) for(int i=x;i<y;i++){cin>>a[i];}

  define seev(v,n) for(int i=0;i<n;i++){int x; cin>>x; v.push_back(x);}

  define sees(s,n) for(int i=0;i<n;i++){int x; cin>>x; s.insert(x);}

  const ll inf = INT_MAX;
  const ld ep = 0.0000001;
  const ld pi = acos(-1.0);
  const ll md = 1000000007;

  int vis[1000005]={0};
  vi adj[1000005];
  queue<int> q;
  int par[1000005];
  bool bfs(int s){
  vis[s]=1;
  q.push(s);
  while(!q.empty()){
  int s = q.front(); q.pop();
  for( auto i: adj[s]){
  if (vis[i]) continue;
  vis[i]=vis[s]+1;
  par[i]=s;
  q.push(i);
  }
  }
  return 0;
  }
  void solve(){
  int n,m; see(n,m);
  char grid[n][m];
  int st=0, end=0;
  rep(i,0,n){
  rep(j,0,m){
  int z = i*m+j;
  see(grid[i][j]);
  if (grid[i][j]=='#') continue;
  if (grid[i][j]=='A') st=z;
  if (grid[i][j]=='B') end=z;
  if (i>=1 && grid[i-1][j]!='#') adj[z].pb(z-m), adj[z-m].pb(z);
  if (j>=1 && grid[i][j-1]!='#') adj[z].pb(z-1), adj[z-1].pb(z);
  }
  }
  bfs(st);
  if (!vis[end]){put("NO"); return;}
  vi v; int i = end;
  while (i!=st){
  v.pb(i);i=par[i];
  }
  putl("YES");putl(v.sz);
  int x = st/m, y = st%m;
  string ans="";
  rev(i,v.sz-1,-1){
  int x1 = v[i]/m, y1 = v[i]%m;
  if (x==x1) ans+=(y>y1?'L':'R');
  else ans+=(x>x1?'U':'D');
  x = x1, y = y1;
  }
  put(ans);
  }
  signed main(){
  IOS;
  #ifdef LOCAL
  freopen("input.txt", "r" , stdin);
  freopen("output.txt", "w", stdout);
  #endif
  int t=1;
  //cin>>t;
  while(t--){
  solve();
  //cout<<'\n';
  }
  #ifdef LOCAL
  clock_t tStart = clock();
  cerr<<fixed<<setprecision(10)<<"\nTime Taken: "<<(double)(clock()- tStart)/CLOCKS_PER_SEC<<endl;
  #endif
  }

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