#771378 (C++17) No.5006 Hidden Maze

提出ソース

結果

問題	No.5006 Hidden Maze
ユーザー	siman
提出日時	2022-06-16 17:04:49
言語	C++17 (gcc 12.3.0 + boost 1.83.0)
結果	AC
実行時間	140 ms / 2,000 ms
コード長	5,080 bytes
コンパイル時間	4,923 ms
実行使用メモリ	22,856 KB
スコア	84,598
平均クエリ数	155.02
最終ジャッジ日時	2022-06-16 17:05:09
合計ジャッジ時間	11,396 ms
ジャッジサーバーID （参考情報）	judge12 / judge11
	純コード判定しない問題か言語

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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	31 ms 21,928 KB
testcase_01	AC	28 ms 21,756 KB
testcase_02	AC	25 ms 21,928 KB
testcase_03	AC	25 ms 21,880 KB
testcase_04	AC	28 ms 22,620 KB
testcase_05	AC	67 ms 21,880 KB
testcase_06	AC	26 ms 21,600 KB
testcase_07	AC	84 ms 22,620 KB
testcase_08	AC	30 ms 22,432 KB
testcase_09	AC	29 ms 21,940 KB
testcase_10	AC	24 ms 22,004 KB
testcase_11	AC	29 ms 22,564 KB
testcase_12	AC	32 ms 22,276 KB
testcase_13	AC	24 ms 22,444 KB
testcase_14	AC	55 ms 21,768 KB
testcase_15	AC	26 ms 22,612 KB
testcase_16	AC	28 ms 22,252 KB
testcase_17	AC	31 ms 21,896 KB
testcase_18	AC	35 ms 21,904 KB
testcase_19	AC	35 ms 21,940 KB
testcase_20	AC	27 ms 21,768 KB
testcase_21	AC	25 ms 22,216 KB
testcase_22	AC	24 ms 22,216 KB
testcase_23	AC	25 ms 21,780 KB
testcase_24	AC	35 ms 21,940 KB
testcase_25	AC	30 ms 21,892 KB
testcase_26	AC	140 ms 21,892 KB
testcase_27	AC	26 ms 21,940 KB
testcase_28	AC	22 ms 21,940 KB
testcase_29	AC	131 ms 21,940 KB
testcase_30	AC	23 ms 21,892 KB
testcase_31	AC	31 ms 21,892 KB
testcase_32	AC	45 ms 21,892 KB
testcase_33	AC	42 ms 21,940 KB
testcase_34	AC	21 ms 22,264 KB
testcase_35	AC	20 ms 22,264 KB
testcase_36	AC	37 ms 21,768 KB
testcase_37	AC	102 ms 22,264 KB
testcase_38	AC	33 ms 21,904 KB
testcase_39	AC	21 ms 22,564 KB
testcase_40	AC	21 ms 21,952 KB
testcase_41	AC	25 ms 21,928 KB
testcase_42	AC	28 ms 22,620 KB
testcase_43	AC	27 ms 22,608 KB
testcase_44	AC	21 ms 22,216 KB
testcase_45	AC	35 ms 21,880 KB
testcase_46	AC	138 ms 22,444 KB
testcase_47	AC	26 ms 21,868 KB
testcase_48	AC	23 ms 22,004 KB
testcase_49	AC	42 ms 21,892 KB
testcase_50	AC	31 ms 22,564 KB
testcase_51	AC	44 ms 22,468 KB
testcase_52	AC	34 ms 22,444 KB
testcase_53	AC	26 ms 22,444 KB
testcase_54	AC	22 ms 22,276 KB
testcase_55	AC	29 ms 21,660 KB
testcase_56	AC	23 ms 22,476 KB
testcase_57	AC	85 ms 22,444 KB
testcase_58	AC	25 ms 22,132 KB
testcase_59	AC	26 ms 21,892 KB
testcase_60	AC	22 ms 22,216 KB
testcase_61	AC	20 ms 21,904 KB
testcase_62	AC	28 ms 21,768 KB
testcase_63	AC	31 ms 21,940 KB
testcase_64	AC	46 ms 22,612 KB
testcase_65	AC	21 ms 21,928 KB
testcase_66	AC	27 ms 21,904 KB
testcase_67	AC	22 ms 21,904 KB
testcase_68	AC	37 ms 22,856 KB
testcase_69	AC	31 ms 21,768 KB
testcase_70	AC	22 ms 21,940 KB
testcase_71	AC	21 ms 22,576 KB
testcase_72	AC	21 ms 22,216 KB
testcase_73	AC	34 ms 21,892 KB
testcase_74	AC	24 ms 22,252 KB
testcase_75	AC	68 ms 22,252 KB
testcase_76	AC	98 ms 21,892 KB
testcase_77	AC	47 ms 21,892 KB
testcase_78	AC	36 ms 21,952 KB
testcase_79	AC	120 ms 22,228 KB
testcase_80	AC	25 ms 22,216 KB
testcase_81	AC	29 ms 21,892 KB
testcase_82	AC	29 ms 22,692 KB
testcase_83	AC	20 ms 22,576 KB
testcase_84	AC	28 ms 21,892 KB
testcase_85	AC	27 ms 21,980 KB
testcase_86	AC	21 ms 21,952 KB
testcase_87	AC	28 ms 21,916 KB
testcase_88	AC	29 ms 21,768 KB
testcase_89	AC	75 ms 21,780 KB
testcase_90	AC	28 ms 22,456 KB
testcase_91	AC	24 ms 22,576 KB
testcase_92	AC	24 ms 21,940 KB
testcase_93	AC	23 ms 21,952 KB
testcase_94	AC	46 ms 22,264 KB
testcase_95	AC	23 ms 21,916 KB
testcase_96	AC	22 ms 21,748 KB
testcase_97	AC	130 ms 21,940 KB
testcase_98	AC	56 ms 21,892 KB
testcase_99	AC	20 ms 21,952 KB

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ソースコード

raw source code

#include <cassert>
#include <cmath>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <climits>
#include <map>
#include <queue>
#include <set>
#include <cstring>
#include <vector>

using namespace std;
typedef long long ll;

const ll CYCLE_PER_SEC = 2400000000;
double TIME_LIMIT = 1.8;

unsigned long long int get_cycle() {
  unsigned int low, high;
  __asm__ volatile ("rdtsc" : "=a" (low), "=d" (high));
  return ((unsigned long long int) low) | ((unsigned long long int) high << 32);
}

double get_time(unsigned long long int begin_cycle) {
  return (double) (get_cycle() - begin_cycle) / CYCLE_PER_SEC;
}

unsigned long long xor128() {
  static unsigned long long rx = 123456789, ry = 362436069, rz = 521288629, rw = 88675123;
  unsigned long long rt = (rx ^ (rx << 11));
  rx = ry;
  ry = rz;
  rz = rw;
  return (rw = (rw ^ (rw >> 19)) ^ (rt ^ (rt >> 8)));
}

const int H = 20;
const int W = 20;
const int DY[4] = {-1, 0, 1, 0};
const int DX[4] = {0, 1, 0, -1};
const string DS[4] = {"U", "R", "D", "L"};
const int MAX_TURN = 1001;
int p;

int ng_counter[H * W][H * W];
int ok_counter[H * W][H * W];

bool is_inside(int y, int x) {
  return 0 <= y && y < H && 0 <= x && x < W;
}

int calc_z(int y, int x) {
  return y * W + x;
}

struct Node {
  int y;
  int x;
  double value;
  int last_dir;

  Node(int y = -1, int x = -1, double value = 0.0, int last_dir = -1) {
    this->y = y;
    this->x = x;
    this->value = value;
    this->last_dir = last_dir;
  }

  bool operator>(const Node &n) const {
    return value > n.value;
  }
};

class HiddenMaze {
public:
  void init() {
    memset(ng_counter, 0, sizeof(ng_counter));
    memset(ok_counter, 0, sizeof(ok_counter));
  }

  void run() {
    ll start_cycle = get_cycle();

    for (int t = 0; t < MAX_TURN; ++t) {
      double cur_time = get_time(start_cycle);
      // fprintf(stderr, "t: %d, cur_time: %f\n", t, cur_time);

      if (cur_time < TIME_LIMIT) {
        vector<int> path = find_path();
        string query = path2str(path);
        int res = send_query(query);
        if (res == -1) break;

        update_maze_data(res, path);
      } else {
        string query = "";
        for (int i = 0; i < 400; ++i) {
          query += "R";
        }
        int res = send_query(query);
      }
    }
  }

  int send_query(string query) {
    cout << query << endl;
    // fprintf(stderr, "send: %s\n", query.c_str());
    int res;
    cin >> res;

    return res;
  }

  string path2str(vector<int> &path) {
    string res = "";

    for (int dir : path) {
      res += DS[dir];
    }

    return res;
  }

  void update_maze_data(int res, vector<int> &path) {
    int cy = 0;
    int cx = 0;

    for (int i = 0; i <= res; ++i) {
      int dir = path[i];
      int ny = cy + DY[dir];
      int nx = cx + DX[dir];
      int z = calc_z(cy, cx);
      int nz = calc_z(ny, nx);

      if (i == res) {
        ng_counter[z][nz]++;
      } else {
        ok_counter[z][nz]++;
      }

      cy = ny;
      cx = nx;
    }
  }

  double calc_wall_rate(int z, int nz) {
    int ok_cnt = ok_counter[z][nz];
    int ng_cnt = ng_counter[z][nz];
    int try_count = (ok_cnt + ng_cnt);

    if (try_count == 0) {
      return 0.5;
    } else if (ok_cnt > 0) {
      return 0.0;
    } else {
      return ng_cnt * 1.0 / try_count;
    }
  }

  vector<int> find_path() {
    priority_queue <Node, vector<Node>, greater<Node>> pque;
    pque.push(Node(0, 0, 0));
    bool visited[H][W];
    int history[H][W];
    memset(history, -1, sizeof(history));
    memset(visited, false, sizeof(visited));

    while (not pque.empty()) {
      Node node = pque.top();
      int z = calc_z(node.y, node.x);
      pque.pop();

      if (visited[node.y][node.x]) continue;
      visited[node.y][node.x] = true;
      history[node.y][node.x] = node.last_dir;

      if (node.y == H - 1 && node.x == W - 1) {
        vector<int> path;
        int cy = node.y;
        int cx = node.x;

        while (cy != 0 || cx != 0) {
          int dir = history[cy][cx];
          path.push_back(dir);
          cy += DY[dir ^ 2];
          cx += DX[dir ^ 2];
        }

        reverse(path.begin(), path.end());
        return path;
      }

      for (int dir = 0; dir < 4; ++dir) {
        int ny = node.y + DY[dir];
        int nx = node.x + DX[dir];
        int nz = calc_z(ny, nx);
        if (not is_inside(ny, nx)) continue;
        int ok_cnt = ok_counter[z][nz];
        int ng_cnt = ng_counter[z][nz];
        int try_count = ok_cnt + ng_cnt;
        double wall_rate = calc_wall_rate(z, nz);

        double value = node.value + 100 * calc_wall_rate(z, nz) + 1.0;
        if (try_count == 0) value -= 1.0;
        if (ok_cnt == 0 && try_count > 1 && wall_rate > 0.5) {
          value += INT_MAX;
        }
        value += 0.0001 * (xor128() % 100);
        Node next(ny, nx, value, dir);
        pque.push(next);
      }
    }

    return vector<int>();
  }
};

int main() {
  int _H, _W;
  cin >> _H >> _W >> p;
  fprintf(stderr, "H: %d, W: %d, p: %d\n", H, W, p);

  HiddenMaze hm;
  hm.run();

  return 0;
}

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結果

テストケース

ソースコード