Submission #758809

#	Time	Username	Problem	Language	Result	Execution time	Memory
758809		PoPularPlusPlus	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	238 ms	34760 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long 
#define pb(e) push_back(e)
#define sv(a) sort(a.begin(),a.end())
#define sa(a,n) sort(a,a+n)
#define mp(a,b) make_pair(a,b)
#define vf first
#define vs second
#define ar array
#define all(x) x.begin(),x.end()
const int inf = 0x3f3f3f3f;
const int mod = 1000000007; 
const double PI=3.14159265358979323846264338327950288419716939937510582097494459230;

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

bool remender(ll a , ll b){return a%b;}

bool can(int x , int e , int x1 , int e1){
	return (abs(x-x1) <= e1-e);
}

bool cmp(pair<int,int> a , pair<int,int> b){
	if(a.vs != b.vs)return a.vs > b.vs;
	return a.vf < b.vf;
}

void solve(){
	int n;
	cin >> n;
	vector<pair<int,int>> arr(n);
	for(int i = 0; i < n; i++)cin >> arr[i].vf >> arr[i].vs;
	
	sort(all(arr),cmp);
	
	set<pair<int,int>> s;
	for(int i = 0; i < n; i++){
		auto it = s.lower_bound(mp(arr[i].vf,-1));
		bool add = 1;
		if(it!=s.end()){
			int idx = (*it).vs;
			if(can(arr[i].vf,arr[i].vs,arr[idx].vf,arr[idx].vs)){
				add = 0;
			}
		}
		if(it != s.begin()){
			it--;
			int idx = (*it).vs;
			if(can(arr[i].vf,arr[i].vs,arr[idx].vf,arr[idx].vs)){
				add = 0;
			}
		}
		if(add)s.insert(mp(arr[i].vf,i));
	}
	cout << s.size() << '\n';
}

int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
//freopen("deleg.in", "r", stdin);
//freopen("deleg.out", "w", stdout);
	//int t;cin >> t;while(t--)
	solve();
	return 0;
}

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