Submission #1286012

#	Time	Username	Problem	Language	Result	Execution time	Memory
1286012		LIA	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	100 / 100	1179 ms	114840 KiB

sortbooks

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vll vector<ll>
#define loop(i, s, e) for (ll i = s; i < e; ++i)
#define pll pair<ll, ll>
const ll inf = 1e18;

struct Node {
  ll ans, mx;
};

struct Seg {
  vector<Node> seg;
  vector<ll> lazy;
  ll sz = 1;
  Seg(ll n) {
    for (; sz < n; sz *= 2)
      ;
    seg.resize(2 * sz, {0, 0});
    lazy.resize(2 * sz, -inf);
  }

  void push(ll i, ll l, ll r) {
    ll& upd = lazy[i];
    if (upd != -inf && l != r) {
      if (seg[i * 2].mx < upd) {
        seg[i * 2].ans = max(seg[i * 2].ans, seg[i * 2].mx + upd);
        lazy[i * 2] = max(lazy[i * 2], upd);
      }
      if (seg[i * 2 + 1].mx < upd) {
        seg[i * 2 + 1].ans = max(seg[i * 2 + 1].ans, seg[i * 2 + 1].mx + upd);
        lazy[i * 2 + 1] = max(lazy[i * 2 + 1], upd);
      }
      upd = -inf;
    }
  }

  void update_val(ll i, ll idx, ll l, ll r, ll val) {
    if (l == r) {
      seg[i].mx = val;
      seg[i].ans = 0;
      lazy[i] = -inf;
      return;
    }
    push(i, l, r);
    ll mid = (l + r) / 2;
    if (idx <= mid)
      update_val(i * 2, idx, l, mid, val);
    else
      update_val(i * 2 + 1, idx, mid + 1, r, val);
    seg[i].mx = max(seg[i * 2].mx, seg[i * 2 + 1].mx);
    seg[i].ans = max(seg[i * 2].ans, seg[i * 2 + 1].ans);
  }

  void update_range(ll i, ll l, ll r, ll a, ll b, ll val) {
    if (l > b || r < a)
      return;
    if (l >= a && r <= b) {
      if (seg[i].mx < val) {
        seg[i].ans = max(seg[i].ans, seg[i].mx + val);
        lazy[i] = max(lazy[i], val);
        return;
      }
      if (l == r)
        return;
    }
    push(i, l, r);
    ll mid = (l + r) / 2;
    update_range(i * 2, l, mid, a, b, val);
    update_range(i * 2 + 1, mid + 1, r, a, b, val);
    seg[i].ans = max(seg[i * 2].ans, seg[i * 2 + 1].ans);
  }

  ll query(ll i, ll l, ll r, ll a, ll b) {
    if (l > b || r < a)
      return 0;
    if (l >= a && r <= b) {
      return seg[i].ans;
    }
    push(i, l, r);
    ll mid = (l + r) / 2;
    return max(query(i * 2, l, mid, a, b), query(i * 2 + 1, mid + 1, r, a, b));
  }
};

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  ll n, m;
  cin >> n >> m;
  vll w(n);
  loop(i, 0, n) cin >> w[i];
  vector<tuple<ll, ll, ll, ll>> queries;
  for (ll j = 0; j < m; ++j) {
    ll l, r, k;
    cin >> l >> r >> k;
    r--;
    l--;
    queries.push_back({l, r, k, j});
  }
  Seg seg(n + 1);
  loop(i, 0, n) seg.update_val(1, i, 0, n - 1, w[i]);
  sort(queries.begin(), queries.end(), [&](const auto& A, const auto& B) {
    return get<0>(A) > get<0>(B);
  });
  ll curL = n;
  vector<ll> ans(m, 0);
  vll st;
  for (auto [l, r, k, j] : queries) {
    while (curL > l) {
      curL--;
      while (!st.empty() && w[st.back()] < w[curL])
        st.pop_back();
      ll R = (st.empty() ? n : st.back());
      if (curL + 1 <= R - 1)
        seg.update_range(1, 0, n - 1, curL + 1, R - 1, w[curL]);
      st.push_back(curL);
    }
    if (l == r) {
      ans[j] = 1;
      continue;
    }
    ll k_for_range = seg.query(1, 0, n - 1, l, r);
    if (k_for_range <= k && k_for_range >= 0) {
      ans[j] = 1;
    } else
      ans[j] = 0;
  }
  for (auto it : ans) {
    cout << it << "\n";
  }
  return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 13 / 13
• Subtask 4: 17 / 17
• Subtask 5: 30 / 30
• Subtask 6: 23 / 23