Submission #785294

#	Time	Username	Problem	Language	Result	Execution time	Memory
785294		KLPP	Advertisement 2 (JOI23_ho_t2)	C++14	100 / 100	134 ms	25664 KiB

Main

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
using namespace __gnu_pbds;
typedef long long int lld;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define trav(a,v) for(auto a:v)

lld absol(lld x){return max(x,-x);}
bool dom(pair<lld,lld> a, pair<lld,lld> b){
	if(absol(a.first-b.first)<=a.second-b.second)return true;
	return false;
}
void solve(){
	int n;
	cin>>n;
	vector<pair<lld,lld> >V(n);
	rep(i,0,n)cin>>V[i].first>>V[i].second;
	sort(V.begin(),V.end());
	vector<pair<lld,lld> >ans;
	trav(a,V){
		if(ans.size()==0){
			ans.push_back(a);
		}else{
			if(!dom(ans[ans.size()-1],a)){
				while(ans.size()>0 && dom(a,ans[ans.size()-1]))ans.pop_back();
				ans.push_back(a);
			}
		}
	}
	cout<<ans.size()<<"\n";
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int tt=1;
	//cin>>tt;
	while(tt--){
		solve();
	}
}

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