Submission

Score: 75

User: rukdk

Problemset: จำนวนเฉพาะก่อนหน้า

Language: cpp

Time: 0.008 second

Submitted On: 2025-10-10 23:07:58

#include<bits/stdc++.h>
using namespace std;
int main(){
	int cnt=0,r=0;
	long long  n;
	int p;
	int arr[5];
	std::cin>>n;
	vector<int> prime(n+1,0);
	for(int i=2;i<n;i++){
		if(prime[i]==0){
			p=i;
			for(int j=p+p;j<=n;j=j+p){
				prime[j]=1;
			}
		}
	}
	for(int i=n;i>0;i--){
		if(prime[i]==0){
			arr[r]=i;
			r++;
			cnt++;
		}
		if(cnt==5){
			break;
		}
	}
	for(int i=r-1;i>=0;i--){
		std::cout<<arr[i]<<" ";
	}
}