Submission #1270547

#	Time	Username	Problem	Language	Result	Execution time	Memory
1270547		goulthen	Advertisement 2 (JOI23_ho_t2)	C++20	100 / 100	664 ms	28320 KiB

Main

#include <bits/stdc++.h>
using namespace std;

//#define int long long
#define ll long long
#define rep(i,a,b) for (int i = a; i <= b; i++)
#define per(i,a,b) for (int i = a; i >= b; i--)
#define fi first
#define se second
#define pii pair<int,int>
#define pb push_back

const int MAXN = 5e5+10;
pii a[MAXN];
bool ok[MAXN];

int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(nullptr);
	int n;cin >> n;
	rep(i,1,n) cin >> a[i].fi >> a[i].se, ok[i] = 1;
	sort(a+1,a+n+1);
	n = unique(a+1,a+n+1)-a-1;

	set<int> st;

	rep(i,1,n) {
		int k = (a[i].fi + a[i].se);
		auto it = st.lower_bound(k);
		ok[i] &= (it == st.end());
		st.insert(k);
	}
	st.clear();
	per(i,n,1) {
		int k = (a[i].se-a[i].fi);
		auto it = st.lower_bound(k);
		ok[i] &= (it == st.end());

		st.insert(k);
	}

	int ans = 0;

	rep(i,1,n) {
		ans+=ok[i];
	}
	cout << ans << '\n';

	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 31 / 31