結果

問題 No.2411 Reverse Directions
ユーザー kanzakihikarukanzakihikaru
提出日時 2023-08-11 23:10:32
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 5,350 bytes
コンパイル時間 5,702 ms
コンパイル使用メモリ 273,272 KB
実行使用メモリ 6,824 KB
最終ジャッジ日時 2024-11-18 18:28:09
合計ジャッジ時間 7,952 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge3
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
6,816 KB
testcase_01 AC 2 ms
6,816 KB
testcase_02 AC 2 ms
6,820 KB
testcase_03 AC 2 ms
6,816 KB
testcase_04 AC 6 ms
6,816 KB
testcase_05 AC 1 ms
6,816 KB
testcase_06 AC 2 ms
6,816 KB
testcase_07 AC 16 ms
6,816 KB
testcase_08 AC 3 ms
6,816 KB
testcase_09 AC 2 ms
6,816 KB
testcase_10 WA -
testcase_11 WA -
testcase_12 WA -
testcase_13 AC 2 ms
6,816 KB
testcase_14 WA -
testcase_15 WA -
testcase_16 AC 3 ms
6,820 KB
testcase_17 WA -
testcase_18 WA -
testcase_19 AC 2 ms
6,820 KB
testcase_20 WA -
testcase_21 AC 2 ms
6,820 KB
testcase_22 WA -
testcase_23 AC 2 ms
6,820 KB
testcase_24 WA -
testcase_25 AC 2 ms
6,816 KB
testcase_26 AC 3 ms
6,816 KB
testcase_27 AC 2 ms
6,816 KB
testcase_28 WA -
testcase_29 WA -
testcase_30 WA -
testcase_31 AC 2 ms
6,816 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <bits/stdc++.h>
#include <atcoder/all>
#include <string>

#define rep(i, l, r) for(ll i = (l); i <= (r); i++)
#define rrep(i, l, r) for(ll i = (r); i >= (l); i--)
#define ff first
#define ss second
#define pb push_back
#define ALL(a) (a).begin(),(a).end()

typedef long long ll;

const int INF32 = 2147483647;
const ll INF64 = 9223372036854775807ll;
const int MAX=5100000;

using namespace std;
using namespace atcoder;

const ll MOD=998244353ll;
using mint = modint998244353;



// aよりもbが大きいならばaをbで更新する
// (更新されたならばtrueを返す)
template <typename T>
bool chmax(T &a, const T& b) {
  if (a < b) {
    a = b;  // aをbで更新
    return true;
  }
  return false;
}
// aよりもbが小さいならばaをbで更新する
// (更新されたならばtrueを返す)
template <typename T>
bool chmin(T &a, const T& b) {
  if (a > b) {
    a = b;  // aをbで更新
    return true;
  }
  return false;
}

//cin, cout
void CIN() {};
template <class T, class... U>
void CIN(T &&x, U &&...y) {
  cin >> x;
  CIN(forward<U>(y)...);
}
void _COUT() { cout << '\n'; }
template <class T, class... U>
void _COUT(T &&x, U &&...y) {
  cout << ' ' << x;
  _COUT(forward<U>(y)...);
}
void COUT() { _COUT(); };
template <class T, class... U>
void COUT(T &&x, U &&...y) {
  cout << x;
  _COUT(forward<U>(y)...);
}

vector<long long> fact, fact_inv, inv;
/*  init_nCk :二項係数のための前処理
    計算量:O(n)
*/
void init_nCk(int SIZE) {
    fact.resize(SIZE + 5);
    fact_inv.resize(SIZE + 5);
    inv.resize(SIZE + 5);
    fact[0] = fact[1] = 1;
    fact_inv[0] = fact_inv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < SIZE + 5; i++) {
        fact[i] = fact[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
        fact_inv[i] = fact_inv[i - 1] * inv[i] % MOD;
    }
}
/*  nCk :MODでの二項係数を求める(前処理 int_nCk が必要)
    計算量:O(1)
*/
long long nCk(int n, int k) {
    assert(!(n < k));
    assert(!(n < 0 || k < 0));
    return fact[n] * (fact_inv[k] * fact_inv[n - k] % MOD) % MOD;
}

bool check_grid(ll x, ll y, ll H, ll W){
  if(x < 0 || H <= x){return false;}
  else if(y < 0 || W <= y){return false;}
  return true;
}

int main()
{
	cin.tie(0);	ios::sync_with_stdio(false);
  ll H, W, K, L, R;
  cin >> H >> W >> K >> L >> R;

  vector<string> S(H); rep(i, 0, H-1){cin >> S.at(i);}

  ll dist = (H-1) + (W-1);
  ll move = K - (R - L + 1);
  if(dist % 2 != K % 2){cout << "No" << endl; return 0;}
  if(move < dist){cout << "No" << endl; return 0;}
  if((R-L+1) % 2 == 1){cout << "No" << endl; return 0;}
  if(L == 1){cout << "No" << endl;}
  if(R == K){cout << "No" << endl;}

  vector<vector<int>> safe(H, vector<int>(W, 0));
  rep(i, 1, H-2){rep(j, 0, W-1){
    if(S[i][j] == '.' && S[i-1][j] == '.' && S[i+1][j] == '.'){safe[i][j] = 1;}
  }}
  rep(i, 0, H-1){rep(j, 1, W-2){
    if(S[i][j] == '.' && S[i][j-1] == '.' && S[i][j+1] == '.'){safe[i][j] = 2;}
  }}

  int di[4] = {1, -1, 0, 0};
  int dj[4] = {0, 0, 1, -1};
  string mv = "DURL";
  string mv_rev = "UDLR";
  vector<vector<int>> dist_from(H, vector<int>(W, -1)); dist_from[0][0] = 0;
  deque<pair<int, int>> que; que.push_back({0, 0});
  while(!que.empty()){
    auto [ni, nj] = que.front(); que.pop_front();
    rep(i, 0, 3){
      int nxi = ni + di[i]; int nxj = nj + dj[i];
      if(check_grid(nxi, nxj, H, W) == false){continue;}
      if(dist_from[nxi][nxj] != -1){continue;}
      dist_from[nxi][nxj] = dist_from[ni][nj] + 1;
      que.push_back({nxi, nxj});
    }
  }

  vector<vector<int>> dist_to(H, vector<int>(W, -1)); dist_to[H-1][W-1] = 0;
  que.push_back({H-1, W-1});
  while(!que.empty()){
    auto [ni, nj] = que.front(); que.pop_front();
    rep(i, 0, 3){
      int nxi = ni + di[i]; int nxj = nj + dj[i];
      if(check_grid(nxi, nxj, H, W) == false){continue;}
      if(dist_to[nxi][nxj] != -1){continue;}
      dist_to[nxi][nxj] = dist_to[ni][nj] + 1;
      que.push_back({nxi, nxj});
    }
  }

  rep(i, 0, H-1){rep(j, 0, W-1){
    ll cnt = K - dist_to[i][j] - dist_from[i][j];
    if(safe[i][j] == 0){continue;}
    if(dist_from[i][j] == -1){continue;}
    if(dist_to[i][j] == -1){continue;}
    if(dist_from[i][j] >= L){continue;}
    if(dist_to[i][j] < (K - R)){continue;}
    if(dist_to[i][j] % 2 != (K - R) % 2){continue;}
    if(cnt % 2 == 1){continue;}
    string ans = "";
    cout << "Yes" << endl;
    int ni = i, nj = j;
    for(ll k = dist_from[i][j]; k > 0; k--){
      rep(x, 0, 3){
        if(check_grid(ni+di[x], nj+dj[x], H, W) == false){continue;}
        if(dist_from[ni+di[x]][nj+dj[x]] == k-1){
          ni = ni+di[x]; nj = nj+dj[x];
          ans.push_back(mv_rev[x]); break;
        }
      }
    }
    reverse(ALL(ans));
    rep(k, 1, cnt){
      if(safe[i][j] == 1){
        if(k % 2 == 0){ans.push_back('U');} else{ans.push_back('D');}
      }
      else{
        if(k % 2 == 0){ans.push_back('L');} else{ans.push_back('R');}
      }
    }
    ni = i; nj = j;
    for(ll k = dist_to[i][j]; k > 0; k--){
      rep(x, 0, 3){
        if(check_grid(ni+di[x], nj+dj[x], H, W) == false){continue;}
        if(dist_to[ni+di[x]][nj+dj[x]] == k-1){
          ni = ni+di[x]; nj = nj+dj[x];
          ans.push_back(mv[x]); break;
        }
      }
    }
    cout << ans << endl; return 0;
  }}
  cout << "No" << endl;

  return 0;
}
0