Submission #1286009

#	Time	Username	Problem	Language	Result	Execution time	Memory
1286009		LIA	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	0 / 100	1012 ms	130944 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) {
      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;
      return;
    }
    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 (seg[i].mx <= val)
      return;
    if (l >= a && r <= b) {
      if (l == r) {
        seg[i].ans = max(seg[i].ans, seg[i].mx + val);
      } else {
        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);
      }
      return;
    }
    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;
    }
    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<vector<tuple<ll, ll, ll>>> byL(n);
  loop(j, 0, m) {
    ll l, r, k;
    cin >> l >> r >> k;
    l--, r--;
    byL[l].push_back({r, k, j});
  }
  Seg seg(n + 1);
  loop(i, 0, n) seg.update_val(1, i, 0, n - 1, w[i]);
  vll nxt(n, n);
  vector<ll> st;
  loop(i, 0, n) {
    while (!st.empty() && w[st.back()] <= w[i]) {
      nxt[st.back()] = i;
      st.pop_back();
    }
    st.push_back(i);
  }
  vector<ll> ans(m, 0);
  for (ll i = n - 1; i >= 0; --i) {
    if (i + 1 <= nxt[i] - 1)
      seg.update_range(1, 0, n - 1, i + 1, nxt[i] - 1, w[i]);
    for (auto [r, k, j] : byL[i]) {
      if (i == r) {
        ans[j] = 1;
        continue;
      }
      ll v = seg.query(1, 0, n - 1, i, r);
      ans[j] = (v <= k && v >= 0) ? 1 : 0;
    }
  }
  loop(i, 0, m) cout << ans[i] << "\n";
  return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 30
• Subtask 6: 0 / 23