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Cod sursa(job #232954)
#include<fstream.h>
#include<string.h>
bool ok[2000000];
int main()
{
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int n, j, i, p = 0;
fin >> n;
for(i = 0; i < n; i++)
ok[i] = true;
for(i = 2; i*i <= n; i++)
if (ok[i])
{
j = 2;
while (i*j <= n)
{
ok [i*j] = 0;
j++;
}
}
for (i = 2; i <= n; i++)
if(ok[i]) fout << i << ' ';
fout << '\n';
fin.close();
fout.close();
return 0;
}