Submission #996299

#	Time	Username	Problem	Language	Result	Execution time	Memory
996299		MilosMilutinovic	Gift Exchange (JOI24_ho_t4)	C++14	50 / 100	2545 ms	14532 KiB

Main

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  vector<int> b(n);
  for (int i = 0; i < n; i++) {
    cin >> b[i];
  }
  vector<int> prv(n);
  {
    vector<int> mx(16 * n, -1);
    vector<int> tag(16 * n, -1);
    auto Push = [&](int x) {
      mx[x * 2] = max(mx[x * 2], tag[x]);
      mx[x * 2 + 1] = max(mx[x * 2 + 1], tag[x]);
      tag[x * 2] = max(tag[x * 2], tag[x]);
      tag[x * 2 + 1] = max(tag[x * 2 + 1], tag[x]);
      tag[x] = -1;
    };
    function<void(int, int, int, int, int, int)> Modify = [&](int x, int l, int r, int ll, int rr, int v) {
      if (ll <= l && r <= rr) {
        mx[x] = max(mx[x], v);
        tag[x] = max(tag[x], v);
        Push(x);
        return;
      }
      Push(x);
      int mid = (l + r) >> 1;
      if (rr <= mid) {
        Modify(x * 2, l, mid, ll, rr, v);
      } else if (ll > mid) {
        Modify(x * 2 + 1, mid + 1, r, ll, rr, v);
      } else {
        Modify(x * 2, l, mid, ll, rr, v);
        Modify(x * 2 + 1, mid + 1, r, ll, rr, v);
      }
      mx[x] = max(mx[x * 2], mx[x * 2 + 1]);
    };
    function<int(int, int, int, int, int)> Query = [&](int x, int l, int r, int ll, int rr) {
      if (ll <= l && r <= rr) {
        return mx[x];
      }
      Push(x);
      int mid = (l + r) >> 1;
      int ret = 0;
      if (rr <= mid) {
        ret = Query(x * 2, l, mid, ll, rr);
      } else if (ll > mid) {
        ret = Query(x * 2 + 1, mid + 1, r, ll, rr);
      } else {
        ret = max(Query(x * 2, l, mid, ll, rr), Query(x * 2 + 1, mid + 1, r, ll, rr));
      }
      mx[x] = max(mx[x * 2], mx[x * 2 + 1]);
      return ret;
    };
    for (int i = 0; i < n; i++) {
      prv[i] = Query(1, 1, 2 * n, b[i], a[i]);
      Modify(1, 1, 2 * n, b[i], a[i], i);
    }
  }
  vector<int> nxt(n);
  {
    vector<int> mn(16 * n, n);
    vector<int> tag(16 * n, n);
    auto Push = [&](int x) {
      mn[x * 2] = min(mn[x * 2], tag[x]);
      mn[x * 2 + 1] = min(mn[x * 2 + 1], tag[x]);
      tag[x * 2] = min(tag[x * 2], tag[x]);
      tag[x * 2 + 1] = min(tag[x * 2 + 1], tag[x]);
      tag[x] = n;
    };
    function<void(int, int, int, int, int, int)> Modify = [&](int x, int l, int r, int ll, int rr, int v) {
      if (ll <= l && r <= rr) {
        mn[x] = min(mn[x], v);
        tag[x] = min(tag[x], v);
        Push(x);
        return;
      }
      Push(x);
      int mid = (l + r) >> 1;
      if (rr <= mid) {
        Modify(x * 2, l, mid, ll, rr, v);
      } else if (ll > mid) {
        Modify(x * 2 + 1, mid + 1, r, ll, rr, v);
      } else {
        Modify(x * 2, l, mid, ll, rr, v);
        Modify(x * 2 + 1, mid + 1, r, ll, rr, v);
      }
      mn[x] = min(mn[x * 2], mn[x * 2 + 1]);
    };
    function<int(int, int, int, int, int)> Query = [&](int x, int l, int r, int ll, int rr) {
      if (ll <= l && r <= rr) {
        return mn[x];
      }
      Push(x);
      int mid = (l + r) >> 1;
      int ret = 0;
      if (rr <= mid) {
        ret = Query(x * 2, l, mid, ll, rr);
      } else if (ll > mid) {
        ret = Query(x * 2 + 1, mid + 1, r, ll, rr);
      } else {
        ret = min(Query(x * 2, l, mid, ll, rr), Query(x * 2 + 1, mid + 1, r, ll, rr));
      }
      mn[x] = min(mn[x * 2], mn[x * 2 + 1]);
      return ret;
    };
    for (int i = n - 1; i >= 0; i--) {
      nxt[i] = Query(1, 1, 2 * n, b[i], a[i]);
      Modify(1, 1, 2 * n, b[i], a[i], i);
    }
  }
  int q;
  cin >> q;
  while (q--) {
    int l, r;
    cin >> l >> r;
    --l; --r;
    bool ok = true;
    for (int i = l; i <= r; i++) {
      if (prv[i] < l && r < nxt[i]) {
        ok = false;
      }
    }
    cout << (ok ? "Yes" : "No") << '\n';
  }
  return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 31 / 31
• Subtask 5: 0 / 8
• Subtask 6: 0 / 12
• Subtask 7: 0 / 18
• Subtask 8: 0 / 12