Submission #957310

#	Time	Username	Problem	Language	Result	Execution time	Memory
957310		Soumya1	Two Antennas (JOI19_antennas)	C++17	100 / 100	400 ms	50900 KiB

antennas

#include <bits/stdc++.h>
using namespace std;
const int mxN = 2e5 + 5;
vector<pair<int, int>> Q[mxN];
vector<int> in[mxN], out[mxN];
pair<int, int> t[4 * mxN];
int f[4 * mxN];
pair<int, int> lazy[4 * mxN];
pair<int, int> merge(pair<int, int> a, pair<int, int> b) {
  return {min(a.first, b.first), max(a.second, b.second)};
}
void apply(int x, pair<int, int> v) {
  f[x] = max({f[x], t[x].second - v.first, v.second - t[x].first});
  lazy[x].first = min(lazy[x].first, v.first);
  lazy[x].second = max(lazy[x].second, v.second);
}
void push(int x, int lx, int rx) {
  if (lx == rx) return;
  apply(x << 1, lazy[x]);
  apply(x << 1 | 1, lazy[x]);
  lazy[x] = {1e9, 0};
}
void update(int x, int lx, int rx, int i, pair<int, int> v) {
  if (lazy[x] != pair<int, int> {1e9, 0}) push(x, lx, rx);
  if (lx == rx) {
    t[x] = v;
    return;
  }
  int mx = (lx + rx) >> 1;
  if (i <= mx) update(x << 1, lx, mx, i, v);
  else update(x << 1 | 1, mx + 1, rx, i, v);
  t[x] = merge(t[x << 1], t[x << 1 | 1]);
}
void update2(int x, int lx, int rx, int l, int r, int v) {
  if (lazy[x] != pair<int, int> {1e9, 0}) push(x, lx, rx);
  if (l > rx || lx > r) return;
  if (l <= lx && r >= rx) {
    apply(x, {v, v});
    return;
  }
  int mx = (lx + rx) >> 1;
  update2(x << 1, lx, mx, l, r, v);
  update2(x << 1 | 1, mx + 1, rx, l, r, v);
  f[x] = max(f[x << 1], f[x << 1 | 1]);
}
int query(int x, int lx, int rx, int l, int r) {
  if (lazy[x] != pair<int, int> {1e9, 0}) push(x, lx, rx);
  if (l > rx || lx > r) return -1;
  if (l <= lx && r >= rx) return f[x];
  int mx = (lx + rx) >> 1;
  return max(query(x << 1, lx, mx, l, r), query(x << 1 | 1, mx + 1, rx, l, r));
}
void testCase() {
  int n;
  cin >> n;
  vector<int> h(n + 1), a(n + 1), b(n + 1);
  for (int i = 1; i <= n; i++) cin >> h[i] >> a[i] >> b[i];
  int q;
  cin >> q;
  for (int i = 0; i < q; i++) {
    int l, r;
    cin >> l >> r;
    Q[r].push_back({l, i});
  }
  for (int i = 1; i <= n; i++) {
    in[min(n + 1, i + a[i])].push_back(i);
    out[min(n + 1, i + b[i] + 1)].push_back(i);
  }
  vector<int> ans(q, -1);
  for (int i = 0; i <= 4 * n; i++) lazy[i] = {1e9, 0}, f[i] = -1;
  for (int i = 1; i <= n; i++) update(1, 1, n, i, {1e9, 0});
  for (int i = 1; i <= n; i++) {
    for (int j : in[i]) {
      update(1, 1, n, j, {h[j], h[j]});
    }
    for (int j : out[i]) {
      update(1, 1, n, j, {1e9, 0});
    }
    if (i - a[i] >= 1) {
      int l = i - b[i], r = i - a[i];
      update2(1, 1, n, l, r, h[i]);
    }
    for (auto [l, j] : Q[i]) {
      ans[j] = query(1, 1, n, l, i);
    }
  }
  for (int i = 0; i < q; i++) cout << ans[i] << "\n";
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  testCase();
  return 0;
}

• Subtask 1: 2 / 2
• Subtask 2: 11 / 11
• Subtask 3: 22 / 22
• Subtask 4: 65 / 65