Submission

Score: 80

User: cyblox_boi

Problemset: จำนวนเฉพาะ (2560)

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-16 09:32:16

#include <iostream>
#include <vector>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n;
    cin >> n;

    vector<bool> prime(n + 1, true);

    for (int p = 2; p * p <= n; p++)
    {
        if (prime[p])
        {
            for (int i = p * p; i <= n; i += p)
            {
                prime[i] = false;
            }
        }
    }

    for (int i = 2; i <= n; i++)
    {
        if (prime[i])
        {
            cout << i << '\n';
        }
    }

    return 0;
}