제출 #1086387

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1086387		avighna	Passport (JOI23_passport)	C++17	48 / 100	839 ms	1048576 KiB

passport

#include <bits/stdc++.h>

typedef long long ll;

const ll inf = 1e15;

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

  ll n;
  std::cin >> n;
  std::vector<ll> l(n + 1), r(n + 1);
  for (ll i = 1; i <= n; ++i) {
    std::cin >> l[i] >> r[i];
  }

  std::vector min_l(n + 1, std::vector<ll>(n + 1, inf));
  std::vector max_r(n + 1, std::vector<ll>(n + 1, inf));
  for (ll i = 1; i <= n; ++i) {
    min_l[i][i] = l[i];
    max_r[i][i] = r[i];
    for (ll j = i + 1; j <= n; ++j) {
      min_l[i][j] = std::min(min_l[i][j - 1], l[j]);
      max_r[i][j] = std::max(max_r[i][j - 1], r[j]);
    }
  }

  auto f = [n](ll i, ll j) { return (j - 1) + (i - 1) * n; };

  std::vector<std::vector<std::pair<ll, ll>>> adj(n * n);

  auto add_edge = [&](ll u, ll v, ll w) { adj[v].push_back({u, w}); };

  for (ll i = 1; i <= n; ++i) {
    add_edge(f(i, i), f(l[i], r[i]), 1);
    for (ll j = i + 1; j <= n; ++j) {
      add_edge(f(i, j), f(i + 1, j), 0);
      add_edge(f(i, j), f(i, j - 1), 0);
      add_edge(f(i, j), f(min_l[i][j], j), 1);
      add_edge(f(i, j), f(i, max_r[i][j]), 1);
    }
  }

  std::deque<ll> dq;
  dq.push_back(f(1, n));
  std::vector<ll> dist(n * n, inf);
  std::vector<bool> vis(n * n);
  dist[f(1, n)] = 0;
  while (!dq.empty()) {
    ll node = dq.front();
    dq.pop_front();
    if (vis[node]) {
      continue;
    }
    vis[node] = true;
    for (auto &[i, w] : adj[node]) {
      if (dist[node] + w < dist[i]) {
        dist[i] = dist[node] + w;
        if (w == 0) {
          dq.push_front(i);
        } else {
          dq.push_back(i);
        }
      }
    }
  }

  ll q;
  std::cin >> q;
  while (q--) {
    ll x;
    std::cin >> x;
    std::cout << (dist[f(x, x)] == inf ? -1 : dist[f(x, x)]) << '\n';
  }
}

• Subtask 1: 0 / 6
• Subtask 2: 16 / 16
• Subtask 3: 24 / 24
• Subtask 4: 8 / 8
• Subtask 5: 0 / 46