Submission

Score: 100

User: lumppengae

Problemset: จำนวนเฉพาะ (2560)

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-06 10:13:24

#include <bits/stdc++.h>
using namespace std;
int main(){
    int a;
    cin>>a;
    bool b[a+1];
    for(int i=0;i<=a;i++){
        b[i]=true;
    }
    b[0]=false;
    b[1]=false;
    for(int i=2;i<=a;i++){
        if(b[i]){
            for(int j=i*i;j<=a;j+=i){
                b[j]=false;
            }
        }
    }
    for(int i=0;i<a;i++){
        if(b[i]){
            cout<<i<<endl;
        }
    }
}