Submission

Score: 0

User: cheetah

Problemset: กังหันสี่ทิศ

Language: cpp

Time: 0.002 second

Submitted On: 2026-09-17 22:12:51

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

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

    int n;
    cin >> n;
    int prime[n + 5];

    for (int i = 0; i < n + 5; ++i) {
        prime[i] = 1;
    }

    for (int i = 2; i <= n; ++i) {
        if (prime[i] == 1) {
            for (int j = 2 * i; j <= n; j += i) {
                prime[j] = 0;
            }
        }
    }

    for (int i = 2; i <= n; ++i) {
        if (prime[i] == 1) {
            cout << i << "\n";
        }
    }

    return 0;
}