Submission #951056

#	Time	Username	Problem	Language	Result	Execution time	Memory
951056		Gromp15	Two Antennas (JOI19_antennas)	C++17	100 / 100	632 ms	40132 KiB

antennas

#include <bits/stdc++.h>
#define ll long long
#define ar array
#define db double
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define rint(l, r) uniform_int_distribution<int>(l, r)(rng)
template<typename T> bool ckmin(T &a, const T &b) { return a > b ? a = b, 1 : 0; }
template<typename T> bool ckmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }
const int INF = int(1e9) + 5;
struct seg {
	int N; vector<int> tree, tree2, lazy;
	seg(int n) : N(1<<(__lg(n)+1)), tree(2*N, -1), tree2(2*N, 1e9), lazy(2*N, -INF) {}
	void push(int node) {
		if (lazy[node] == -INF) return;
		ckmax(tree[node], lazy[node] - tree2[node]);
		if (node < N) {
			ckmax(lazy[node*2], lazy[node]);
			ckmax(lazy[node*2+1], lazy[node]);
		}
		lazy[node] = -INF;
	}
	void update(int node, int nl, int nr, int pos, int x) {
		push(node);
		if (pos > nr || pos < nl) return;
		if (nl == nr && nl == pos) {
			tree2[node] = x; return;
		}
		int mid = (nl+nr)/2;
		update(node*2, nl, mid, pos, x);
		update(node*2+1, mid+1, nr, pos, x);
		tree[node] = max(tree[node*2], tree[node*2+1]);
		tree2[node] = min(tree2[node*2], tree2[node*2+1]);
	}
	void update2(int node, int nl, int nr, int ql, int qr, int x) {
		push(node);
		if (ql > nr || qr < nl) return;
		if (ql <= nl && nr <= qr) {
			ckmax(lazy[node], x); push(node); return;
		}
		int mid = (nl+nr)/2;
		update2(node*2, nl, mid, ql, qr, x);
		update2(node*2+1, mid+1, nr, ql, qr, x);
		tree[node] = max(tree[node*2], tree[node*2+1]);
	}
	int query(int node, int nl, int nr, int ql, int qr) {
		push(node);
		if (ql > nr || qr < nl) return -1;
		if (ql <= nl && nr <= qr) {
			return tree[node];
		}
		int mid = (nl+nr)/2;
		return max(query(node*2, nl, mid, ql, qr), query(node*2+1, mid+1, nr, ql, qr));
	}
	void update(int pos, int x) {
		update(1, 0, N-1, pos, x);
	}
	void update2(int l, int r, int x) {
		update2(1, 0, N-1, l, r, x);
	}
	int query(int l, int r) {
		return query(1, 0, N-1, l, r);
	}
};
void test_case() {
	int n; cin >> n;
	vector<int> h(n), a(n), b(n);
	for (int i = 0; i < n; i++) cin >> h[i] >> a[i] >> b[i];
	int q; cin >> q;
	vector<int> ans(q, -1);
	vector<vector<ar<int, 2>>> queries(n);
	for (int i = 0; i < q; i++) {
		int l, r; cin >> l >> r;
		l--, r--;
		queries[r].push_back({l, i});
	}
	for (int t = 0; t < 2; t++) {
		seg st(n);
		vector<vector<int>> in(n), out(n);
		for (int i = 0; i < n; i++) {
			if (i + a[i] < n) in[i + a[i]].emplace_back(i);
			if (i + b[i] + 1 < n) out[i + b[i] + 1].emplace_back(i);
		}
		for (int i = 0; i < n; i++) {
			for (int p : in[i]) st.update(p, h[p]);
			for (int p : out[i]) st.update(p, 1e9);
			int l = max(0, i - b[i]), r = i - a[i];
			if (l <= r) {
				st.update2(l, r, h[i]);
			}
			for (auto [from, ans_idx] : queries[i]) {
				ckmax(ans[ans_idx], st.query(from, i));
			}
		}
		for (int &x : h) x *= -1;
	}
	for (int i = 0; i < q; i++) cout << ans[i] << '\n';


}
int main() {
    cin.tie(0)->sync_with_stdio(0);
    int t = 1;
//    cin >> t;
    while (t--) test_case();
}

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