Submission

Score: 80

User: Bestzu

Problemset: จำนวนเฉพาะ (2560)

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-02 20:07:46

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false); cin.tie(0);

    int n; 
    cin >> n;

    vector<bool> is_prime(n+1, true);
    is_prime[0] = is_prime[1] = false;

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


    for (int i = 2; i <= n; i++) {
        if (is_prime[i]) cout << i << endl;
    }
}