제출 #1167857

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1167857		usukhbaatar	Bouquet (EGOI24_bouquet)	C++20	100 / 100	194 ms	15768 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int maxn = 2e5 + 1;

int n, l[maxn], r[maxn];
int ans, dp[maxn];
int st[maxn << 2];
vector<int> que[maxn];

void update(int i, int tl, int tr, int p, int v) {
	if (tl == tr) {
		st[i] = v; return;
	}
	int x = (i << 1) + 1, y = x + 1;
	int tm = (tl + tr) >> 1;
	if (p <= tm) update(x, tl, tm, p, v);
	else update(y, tm + 1, tr, p, v);
	st[i] = max(st[x], st[y]);
}

int query(int i, int tl, int tr, int l, int r) {
	if (tl == l && r == tr) return st[i];
	int x = (i << 1) + 1, y = x + 1;
	int tm = (tl + tr) >> 1;
	if (r <= tm) return query(x, tl, tm, l, r);
	if (tm < l) return query(y, tm + 1, tr, l, r);
	return max(
		query(x, tl, tm, l, tm),
		query(y, tm + 1, tr, tm + 1, r)
	);
}

int main() {
	cin >> n;
	for (int i = 1; i <= n; i++)
		cin >> l[i] >> r[i];
	
	for (int i = 1; i <= n; i++) {
		int ll = i - l[i], rr = i + r[i];
		dp[i] = query(0, 0, n, 0, max(0, ll - 1)) + 1;
		ans = max(ans, dp[i]);
		if (rr <= n) que[rr].push_back(i);
		for (int j : que[i]) {
			update(0, 0, n, j, dp[j]);
		}
	}
	cout << ans << endl;
	return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 16 / 16
• Subtask 3: 28 / 28
• Subtask 4: 18 / 18
• Subtask 5: 30 / 30