Cod sursa(job #2302285)

Utilizator BlaugranasEnal Gemaledin Blaugranas Data 14 decembrie 2018 07:25:37
Problema Ciurul lui Eratosthenes Scor 70
Compilator c-64 Status done
Runda Arhiva educationala Marime 0.3 kb
Raporteaza aceasta sursa 
#include<stdio.h>
int n,i,j,k,p[2000001];
int main()
{
	freopen("ciur.in","r",stdin),freopen("ciur.out","w",stdout),scanf("%d",&n);
	for(i=2;i*i<=n;i++)
        if(!p[i])
            for(j=2*i;j<=n;j+=i)
                p[j]=1;
    for(i=2;i<=n;i++)
        if(!p[i])
            k++;
	printf("%d",k);
}