Cod sursa(job #2971597)

Utilizator BubbleDSKjsakfn sd Bubble Data 27 ianuarie 2023 17:52:01
Problema Ciurul lui Eratosthenes Scor 70
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.31 kb
Raporteaza aceasta sursa 
#include <bits/stdc++.h>
using namespace std;
int main(){
	freopen("ciur.in","r",stdin);
	freopen("ciur.out","w",stdout);

	int n;
	cin>>n;
	bool a[n]={};
	a[0]=a[1]=true;
	int rs=0;
	for(int i=2;i<=n;i++){
		if(a[i]==false)
		rs++;
		for(int j=i*2;j<=n;j+=i)
		a[j]=true;
	}
	cout<<rs;
	return 0;
}