Submission #860595

#	Time	Username	Problem	Language	Result	Execution time	Memory
860595		SuouYuki	Passport (JOI23_passport)	C++17	100 / 100	424 ms	43420 KiB

passport

#include <bits/stdc++.h>

using namespace std;

int main() {
      ios::sync_with_stdio(false);
      cin.tie(nullptr);

      int n;
      cin >> n;

      vector<int> l(n), r(n);
      for (int i = 0; i < n; i++) {
            cin >> l[i] >> r[i];
            l[i] -= 1;
      }

      vector<vector<int>> f(n * 2);
      for (int i = 0; i < n; i++) {
            for (int u = l[i] + n, v = r[i] + n; u < v; u >>= 1, v >>= 1) {
                  if (u & 1) {
                        f[u++].emplace_back(i);
                  }
                  if (v & 1) {
                        f[--v].emplace_back(i);
                  }
            }
      }

      auto func = [&](vector<int> &d) -> void {
            priority_queue<pair<int, int>> pri_que;
            for (int i = 0; i < n; i++) {
                  pri_que.emplace(-d[i], i);
            }

            vector<bool> vis(n), used(n * 2);

            while (!pri_que.empty()) {
                  int u = pri_que.top().second;
                  pri_que.pop();

                  if (!vis[u]) {
                        vis[u] = true;
                        int x = u + n;
                        while (x > 0 && !used[x]) {
                              used[x] = true;
                              for (int v : f[x]) {
                                    if (d[v] > d[u] + 1) {
                                          d[v] = d[u] + 1;
                                          pri_que.emplace(-d[v], v);
                                    }
                              }
                              x >>= 1;
                        }
                  }
            }
      };

      vector<int> pr(n, 1 << 27);
      pr[0] = 0;
      func(pr);
      pr[0] = 1;

      vector<int> su(n, 1 << 27);
      su[n - 1] = 0;
      func(su);
      su[n - 1] = 1;

      vector<int> d(n);
      for (int i = 0; i < n; i++) {
            d[i] = pr[i] + su[i];
      }
      func(d);

      for (int i = 0; i < n; i++) {
            if (d[i] > n) {
                  d[i] = -1;
            }
            else {
                  d[i] -= 1;
            }
      }

      int q;
      cin >> q;

      while (q--) {
            int x;
            cin >> x;
            x -= 1;
            cout << d[x] << "\n";
      }

      return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 16 / 16
• Subtask 3: 24 / 24
• Subtask 4: 8 / 8
• Subtask 5: 46 / 46