結果

問題 No.2222 Respawn
ユーザー SSRS
提出日時 2023-02-17 22:19:17
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
TLE  
実行時間 -
コード長 1,797 bytes
コンパイル時間 1,494 ms
コンパイル使用メモリ 171,560 KB
実行使用メモリ 14,016 KB
最終ジャッジ日時 2024-07-19 13:28:11
合計ジャッジ時間 5,151 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
このコードへのチャレンジ
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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 #
プレゼンテーションモードにする

#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);
      dp2_p[i] = 1;
      for (int j = i; j < N; j++){
        if (S[j] == '.'){
          for (int k = j + 1; k <= j + 2; k++){
            if (S[k] == '.'){
              dp2_p[k] += dp2_p[j] / 3;
              dp2_pe[k] += (dp2_p[j] + dp2_pe[j]) / 3;
            }
          }
        }
      }
      for (int j = i + 1; j < N - 1; j++){
        if (S[j] == '.'){
          dp[i] += (dp2_pe[j] / dp2_p[j] + 1 + dp[j]) * dp2_p[j] / 3 / (1 - gameover_p);
        }
      }
    }
  }
  cout << dp[0] << endl;
}
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