Submission

Score: 100

User: chickennuggget

Problemset: จำนวนเฉพาะก่อนหน้า

Language: cpp

Time: 0.040 second

Submitted On: 2025-10-16 18:44:50

#include<bits/stdc++.h>
using namespace std;
int main ()
{
    ios::sync_with_stdio(0);cin.tie(nullptr);
    int n;
    cin>>n;
    vector<bool> b(n,0);
    vector<int> ans;
    for(int i=2;i<=n;i++)
    {  
        if(!(b[i]))
        {
            for(int j=2*i;j<=n;j+=i)
            {
                b[j]=true;
            }
        }
    }
    for(int i=2;i<=n;i++)
    {
        //if(!(b[i])) cout<<i<<" ";
    }
    int c=0;
    for(int i=n-1;i>=2;i--)
    {
        if(!(b[i]))
        {
            //cout<<i<<" ";
            ans.push_back(i);
            c++;
        }
        if(c==5) break;
    }
    for(int i=4;i>=0;i--)
    {
        cout<<ans[i]<<" ";
    }
}