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- int a[45002], n;
- int prime[5000], k;
- void Ciur(int n)
- {
- int i, j;
- for(i = 3; i * i <= n; i += 2)
- if(a[i] == 0)
- for(j = i * i; j <= n; j = j + 2 * i)
- a[j] = 1;
- k = 0;
- prime[++k] = 2;
- for(i = 3; i <= n; i += 2)
- if(a[i] == 0)
- prime[++k] = i;
- }
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