Submission #532815

#	Time	Username	Problem	Language	Result	Execution time	Memory
532815		8e7	Two Antennas (JOI19_antennas)	C++17	100 / 100	866 ms	46656 KiB

antennas

//Challenge: Accepted
#include <bits/stdc++.h>
using namespace std;
#ifdef zisk
void debug(){cout << endl;}
template<class T, class ... U> void debug(T a, U ... b){cout << a << " ", debug(b...);}
template<class T> void pary(T l, T r) {
	while (l != r) cout << *l << " ", l++;
	cout << endl;
}
#else
#define debug(...) 0
#define pary(...) 0
#endif
#define ll long long
#define maxn 200005
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);

const ll inf = 1<<30;
struct beats{
	ll seg[4*maxn], tag[4*maxn], mi[4*maxn];
	void push(int cur, int l, int r) {
		if (tag[cur] == -inf) return;
		seg[cur] = max(seg[cur], tag[cur] - mi[cur]);
		if (r - l > 1) {
			tag[cur*2] = max(tag[cur*2], tag[cur]);
			tag[cur*2+1] = max(tag[cur*2+1], tag[cur]);
		}
		tag[cur] = -inf;
	}
	void pull(int cur, int l, int r) {
		int m = (l + r) / 2;
		if (r - l > 1) {
			push(cur*2, l, m);	
			push(cur*2+1, m, r);
			seg[cur] = max(seg[cur], max(seg[cur*2], seg[cur*2+1]));
			mi[cur] = min(mi[cur*2], mi[cur*2+1]);
		}
	}
	void init(int cur, int l, int r) {
		if (r <= l) return;
		tag[cur] = -inf;
		seg[cur] = -inf;
		if (r - l == 1) {
			mi[cur] = inf;
			return;
		}
		int m = (l + r) / 2;
		init(cur*2, l, m), init(cur*2+1, m, r);
		pull(cur, l, r);
	}
	void modify(int cur, int l, int r, int ind, ll val) {
		if (r <= l) return;
		push(cur, l, r);
		if (r - l == 1) {
			mi[cur] = val;
			return;
		}
		int m = (l + r) / 2;
		if (ind < m) modify(cur*2, l, m, ind, val);
		else modify(cur*2+1, m, r, ind, val);
		pull(cur, l, r);
	}
	void chmax(int cur, int l, int r, int ql, int qr, ll val) {
		if (r <= l || ql >= r || qr <= l) return;
		if (ql <= l && qr >= r) {
			tag[cur] = max(tag[cur], val);
			return;
		}
		int m = (l + r) / 2;
		chmax(cur*2, l, m, ql, qr, val);
		chmax(cur*2+1, m, r, ql, qr, val);
		pull(cur, l, r);
	}
	ll query(int cur, int l, int r, int ql, int qr) {
		if (r <= l || ql >= r || qr <= l) return -inf;
		push(cur, l, r);
		if (ql <= l && qr >= r) {
			pull(cur, l, r);	
			//debug(l, r, seg[cur]);
			return seg[cur];
		}
		int m = (l + r) / 2;
		return max(query(cur*2, l, m, ql, qr), query(cur*2+1, m, r, ql, qr));
	}
} tr;

ll h[maxn], ans[maxn];
int a[maxn], b[maxn];
vector<pii> que[maxn], ev[maxn];
void solve(int n) {
	tr.init(1, 0, n);
	for (int i = 0;i < n;i++) ev[i].clear();
	for (int i = 0;i < n;i++) {
		//debug(i);
		for (auto [id, ch]:ev[i]) {
			//debug("mod", id, ch);
			if (ch == 1) tr.modify(1, 0, n, id, h[id]);
			else tr.modify(1, 0, n, id, inf);	
		}
		int l = max(0, i - b[i]), r = max(-1, i - a[i]);
		//debug("chmax", l, r, h[i]);
		tr.chmax(1, 0, n, l, r+1, h[i]);
		for (auto [lef, id]:que[i]) {
			//debug("que", id, tr.query(1, 0, n, lef, i+1));
			ans[id] = max(ans[id], tr.query(1, 0, n, lef, i+1));
		}

		l = min(n, i+a[i]), r = min(n, i + b[i] + 1);
		ev[l].push_back({i, 1}), ev[r].push_back({i, -1});
	}
}
int main() {
	io
	int n;
	cin >> n;
	for (int i = 0;i < n;i++) {
		cin >> h[i] >> a[i] >> b[i];
	}
	int q;
	cin >> q;
	for (int i = 0;i < q;i++) {
		ans[i] = -1;
		int l, r;
		cin >> l >> r;
		r--, l--;
		que[r].push_back({l, i});
	}
	solve(n);
	for (int i = 0;i < n;i++) h[i] = -h[i];
	solve(n);
	for (int i = 0;i < q;i++) cout << ans[i] << "\n";
}

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