Submission #864756

#	Time	Username	Problem	Language	Result	Execution time	Memory
864756		NeroZein	Passport (JOI23_passport)	C++17	48 / 100	2093 ms	40876 KiB

passport

#include "bits/stdc++.h"
using namespace std;

#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif

using arr = pair<int, int>; 

const int N = 2e5 + 5;

int seg[N * 2]; 
vector<int> vec[N * 2]; 

void init() {
  for (int i = 0; i < N * 2; ++i) {
    seg[i] = N; 
  }
}

void upd(int nd, int l, int r, int p, int v) {
  if (l == r) {
    seg[nd] = v;
    return;
  }
  int mid = (l + r) >> 1;
  int rs = nd + ((mid - l + 1) << 1);
  if (p <= mid) {
    upd(nd + 1, l, mid, p, v);
  } else {
    upd(rs, mid + 1, r, p, v); 
  }
  seg[nd] = min(seg[nd + 1], seg[rs]); 
}

int qry(int nd, int l, int r, int s, int e) {
  if (l >= s && r <= e) {
    return seg[nd];
  }
  int mid = (l + r) >> 1;
  int rs = nd + ((mid - l + 1) << 1);
  if (mid >= e) {
    return qry(nd + 1, l, mid, s, e);
  } else {
    if (mid < s) {
      return qry(rs, mid + 1, r, s, e); 
    } else {
      return min(qry(nd + 1, l, mid, s, e), qry(rs, mid + 1, r, s, e)); 
    }
  }
}

void add(int nd, int l, int r, int s, int e, int x) {
  if (l >= s && r <= e) {
    vec[nd].push_back(x);
    return;
  }
  int mid = (l + r) >> 1;
  int rs = nd + ((mid - l + 1) << 1);
  if (mid >= e) {
    add(nd + 1, l, mid, s, e, x); 
  } else {
    if (mid < s) {
      add(rs, mid + 1, r, s, e, x); 
    } else {
      add(nd + 1, l, mid, s, e, x); 
      add(rs, mid + 1, r, s, e, x); 
    }
  }
}

vector<int> tv; 
void fill(int nd, int l, int r, int p) {
  for (int i : vec[nd]) {
    tv.push_back(i);
  }
  vec[nd].clear();
  if (l == r) {
    return; 
  }
  int mid = (l + r) >> 1;
  int rs = nd + ((mid - l + 1) << 1);
  if (p <= mid) {
    fill(nd + 1, l, mid, p); 
  } else {
    fill(rs, mid + 1, r, p);
  }
}

int l[N], r[N]; 
int a[N], b[N], ans[N]; 

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n;
  cin >> n;
  for (int i = 0; i < n; ++i) {
    cin >> l[i] >> r[i]; 
    --l[i], --r[i];
  }
  vector<int> id(n);
  iota(id.begin(), id.end(), 0);
  sort(id.begin(), id.end(), [&](int i, int j) {
    return l[i] < l[j]; 
  });
  init(); 
  for (int i = 0; i < n; ++i) {
    int cur = id[i];
    if (l[cur] == 0) {
      a[cur] = 0;  
    } else {
      a[cur] = 1 + qry(0, 0, n - 1, l[cur], r[cur]); 
    }
    upd(0, 0, n - 1, cur, a[cur]); 
  }
  sort(id.begin(), id.end(), [&](int i, int j) {
    return r[i] > r[j]; 
  });
  init();
  priority_queue<arr, vector<arr>, greater<arr>> pq; 
  for (int i = 0; i < n; ++i) {
    int cur = id[i];
    if (r[cur] == n - 1) {
      b[cur] = 0; 
    } else {
      b[cur] = 1 + qry(0, 0, n - 1, l[cur], r[cur]); 
    }
    upd(0, 0, n - 1, cur, b[cur]); 
    pq.emplace(a[cur] + b[cur], cur); 
    add(0, 0, n - 1, l[cur], r[cur], cur); 
    ans[cur] = a[cur] + b[cur];
  }
  while (!pq.empty()) {
    auto [c, v] = pq.top();
    pq.pop();
    if (c > ans[v]) {
      continue;
    }
    fill(0, 0, n - 1, v); 
    for (int i : tv) {
      if (ans[v] + 1 < ans[i]) {
        ans[i] = ans[v] + 1;
        pq.emplace(ans[i], i); 
      }
    }
  }
  int q;
  cin >> q;
  while (q--) {
    int v;
    cin >> v;
    --v;
    cout << (ans[v] >= N ? -1 : ans[v] + 1) << '\n'; 
  }
  return 0;
}

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