Submission #921665

#	Time	Username	Problem	Language	Result	Execution time	Memory
921665		vjudge1	Lightning Rod (NOI18_lightningrod)	C++17	44 / 100	2033 ms	262144 KiB

Main

#include <bits/stdc++.h>
#define F first 
#define S second
#define ent '\n'
#define int long long
#define pb push_back

typedef long double ld;
typedef long long ll;
using namespace std;

const int maxn = 1e6+12;
const int T = 0;
const int mod = 1e9+7;

int n,m,k,x,y,l,r;
int p[maxn],pref[maxn],fact[maxn];

void solve(){
	cin>>n;
	int a[n+2],b[n+2];
	int cnt=0;
	vector<pair<int,int>>v;
	for(int i=1;i<=n;i++){
		cin>>a[i]>>b[i];
		if(b[i]==1)cnt++;
	}
	if(cnt==n){
		cout<<n;
		return;
	}
	for(int i=1;i<=n;i++){
		v.pb({b[i],a[i]});
	}
//	abs(x[i] - x[j]) <= abs(y[i] - y[j]);
	int ans=0;
	map<int,int>mp; 
	sort(v.begin(),v.end());
	for(int i=v.size()-1;i>=0;i--){
		if(!mp[i]){
			ans++;
			for(int j=i-1;j>=0;j--){
				if((v[i].F - v[j].F) >= abs(v[i].S - v[j].S))mp[j]=1;
			}
		}
	}
	cout<<ans;
}	
//BEKSULTAN TOP
signed main(){	
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int t=1;
	if(T)cin>>t;
	while(t--)solve();
} 

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 0 / 26
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20