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Jan 20th, 2020
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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. ifstream f("eratostene8.in");
  4. ofstream g("eratostene8.out");
  5. int n,t,x,s,d,v[10000005],a[10005];
  6. int main()
  7. {
  8. f>>n>>t;
  9. for(int i=1; i<=n; i++)
  10. f>>a[i];
  11. sort(a+1,a+n+1);
  12. for(int i=1; i<=n; i++)
  13. if(a[i]!=a[i+1])
  14. for(int j=a[i]; j<=10000000; j+=a[i])
  15. v[j]=1;
  16. for(int i=1; i<=10000000; i++)
  17. v[i]+=v[i-1];
  18. for(int i=1; i<=t; i++)
  19. {
  20. f>>s>>d;
  21. g<<v[d]-v[s-1]<<"\n";
  22. }
  23. return 0;
  24. }
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