Submission

Score: 80

User: boygunner

Problemset: จำนวนเฉพาะ (2560)

Language: cpp

Time: 0.004 second

Submitted On: 2026-09-29 19:59:23

#include <iostream>
using namespace std;

bool isprime(int x)
{
	if(x==2) return true;
	else{
		for(int i=3;i*i<=x;i=i+2)
			if(x%i==0) return false;
		return true;
	}
}

int main(){
	int num;
	cin >>num;
	for(int i=2;i<=num;i=i+2){
		if(isprime(i)) cout<<i<<endl;
		if(i==2) i=1;
	}
}