結果

問題 No.2222 Respawn
ユーザー SSRSSSRS
提出日時 2023-02-17 22:27:32
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
TLE  
実行時間 -
コード長 1,750 bytes
コンパイル時間 1,603 ms
コンパイル使用メモリ 169,956 KB
実行使用メモリ 18,204 KB
最終ジャッジ日時 2024-07-19 13:36:56
合計ジャッジ時間 5,547 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge1
このコードへのチャレンジ
（要ログイン）
ファイルパターン 結果
sample AC * 3
other AC * 10 TLE * 1 -- * 19
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>
using namespace std;
int main(){
  cout << fixed << setprecision(20);
  int N;
  cin >> N;
  string S;
  cin >> S;
  S += '#';
  vector<double> dp_gameover_p(N, 0);
  vector<double> dp_gameover_pe(N, 0);
  vector<double> dp_goal_p(N, 0);
  vector<double> dp_goal_pe(N, 0);
  dp_goal_p[N - 1] = 1;
  for (int i = N - 2; i >= 0; i--){
    if (S[i] == '.'){
      for (int j = i + 1; j <= i + 2; j++){
        if (S[j] == '#'){
          dp_gameover_p[i] += (double) 1 / 3;
          dp_gameover_pe[i] += (double) 1 / 3;
        } else {
          dp_gameover_p[i] += dp_gameover_p[j] / 3;
          dp_gameover_pe[i] += (dp_gameover_p[j] + dp_gameover_pe[j]) / 3;
          dp_goal_p[i] += dp_goal_p[j] / 3;
          dp_goal_pe[i] += (dp_goal_p[j] + dp_goal_pe[j]) / 3;
        }
      }
    }
  }
  vector<double> dp(N, 0);
  for (int i = N - 2; i >= 0; i--){
    if (S[i] == '.'){
      double gameover_p = dp_gameover_p[i] + (double) 1 / 3;
      double gameover_pe = dp_gameover_pe[i] + (double) 1 / 3;
      dp[i] += (1 / (1 - gameover_p) - 1) * (gameover_pe / gameover_p);
      double goal_rel = dp_goal_p[i] / (1 - gameover_p);
      dp[i] += goal_rel * (dp_goal_pe[i] / dp_goal_p[i]);
      vector<double> dp2_p(N, 0);
      vector<double> dp2_pe(N, 0);
      for (int j = N - 2; j >= 0; j--){
        if (S[j] == '.'){
          for (int k = j + 1; k <= j + 2; k++){
            if (S[k] == '.' && k < N - 1){
              dp2_p[j] += (double) 1 / 9;
              dp2_pe[j] += (2 + dp[k]) / 9;
              dp2_p[j] += dp2_p[k] / 3;
              dp2_pe[j] += (dp2_p[k] + dp2_pe[k]) / 3;
            }
          }
        }
      }
      dp[i] += dp2_pe[i] / (1 - gameover_p);
    }
  }
  cout << dp[0] << endl;
}
0