#770530 (C++17(gcc12)) No.5006 Hidden Maze

• 問題: No.5006 Hidden Maze
• ユーザー: trineutron
• 提出日時: 2022-06-12 15:46:00
• 言語: C++17(gcc12) (gcc 12.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 134 ms / 2,000 ms
• コード長: 3,514 bytes
• コンパイル時間: 2,443 ms
• 実行使用メモリ: 22,756 KB
• スコア: 86,085
• 平均クエリ数: 140.15
• 最終ジャッジ日時: 2022-06-12 15:46:19
• 合計ジャッジ時間: 10,201 ms
• ジャッジサーバーID （参考情報）: judge15 / judge16

ファイルパターン	結果
other	AC * 100

ソースコード

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#include <bits/stdc++.h>
using namespace std;
using edge = tuple<int, int, int>;
const vector<int> dx{1, 0, -1, 0, 1, 0, -1, 0}, dy{0, 1, 0, -1, 0, 1, 0, -1};
const string ds{'D', 'R', 'U', 'L', 'D', 'R', 'U', 'L'};
random_device rng;
int h, w, p;
bool in_board(int x, int y) { return 0 <= x and x < h and 0 <= y and y < w; }
int main() {
    int default_cost = 2;
    cin >> h >> w >> p;
    vector cost_h(h, vector<int>(w - 1, 2));
    vector cost_v(h - 1, vector<int>(w, 2));
    while (true) {
        vector dist(h, vector<int>(w, 1e9));
        priority_queue<edge, vector<edge>, greater<edge>> q;
        q.emplace(0, 0, 0);
        while (not q.empty()) {
            auto [d0, x0, y0]{q.top()};
            q.pop();
            if (d0 >= dist[x0][y0]) continue;
            dist[x0][y0] = d0;
            for (int i = 0; i < 4; i++) {
                int x = x0 + dx[i], y = y0 + dy[i];
                if (not in_board(x, y)) continue;
                int c;
                if (i % 2 == 0) {
                    c = cost_v.at(x0 - i / 2).at(y0);
                } else {
                    c = cost_h.at(x0).at(y0 - i / 2);
                }
                int d = d0 + c;
                if (d >= dist[x][y]) continue;
                q.emplace(d, x, y);
            }
        }
        vector<int> dirs;
        string ans;
        int x0 = h - 1, y0 = w - 1;
        while (x0 or y0) {
            int d0 = dist[x0][y0];
            vector<int> ok;
            for (int i = 0; i < 4; i++) {
                int x = x0 + dx[i], y = y0 + dy[i];
                if (not in_board(x, y)) continue;
                int c;
                if (i % 2 == 0) {
                    c = cost_v[x0 - i / 2][y0];
                } else {
                    c = cost_h[x0][y0 - i / 2];
                }
                int d = d0 - c;
                if (d != dist[x][y]) continue;
                ok.emplace_back((i + 2) % 4);
            }
            int sz = ok.size();
            int d = ok.at(rng() % sz);
            dirs.emplace_back(d);
            ans += ds[d];
            x0 -= dx[d];
            y0 -= dy[d];
        }
        reverse(dirs.begin(), dirs.end());
        reverse(ans.begin(), ans.end());
        cout << ans << endl;
        int res;
        cin >> res;
        if (res == -1) {
            break;
        }
        for (int i = 0; i < res; i++) {
            int d = dirs[i];
            int x = x0 + dx[d], y = y0 + dy[d];
            if (d % 2 == 0) {
                cost_v[x0 - d / 2][y0] = 1;
            } else {
                cost_h[x0][y0 - d / 2] = 1;
            }
            x0 = x;
            y0 = y;
        }
        if (int(ans.size()) > res) {
            int d = dirs[res];
            if (d % 2 == 0) {
                if (cost_v[x0 - d / 2][y0] == 1) continue;
                cost_v[x0 - d / 2][y0] += 10000;
            } else {
                if (cost_h[x0][y0 - d / 2] == 1) continue;
                cost_h[x0][y0 - d / 2] += 10000;
            }
        }
        for (int i = 0; i < h; i++) {
            for (int j = 0; j < w; j++) {
                if (i < h - 1) {
                    if (cost_v[i][j] == default_cost) {
                        cost_v[i][j]++;
                    }
                }
                if (j < w - 1) {
                    if (cost_h[i][j] == default_cost) {
                        cost_h[i][j]++;
                    }
                }
            }
        }
        default_cost++;
    }
    return 0;
}
 
 
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