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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4. const int MAX = 500005;
  5. vector<int> p[MAX];
  6. int cnt[MAX], mul[MAX], a[MAX], has[MAX];
  7. long long ans;
  8. void add(int val, int sign)
  9. {
  10. 	for (int mask = 0; mask < (1 << p[val].size()); mask++)
  11. 	{
  12. 		if (!mask)
  13. 			mul[mask] = 1;
  14. 		else
  15. 			mul[mask] = mul[mask & (mask - 1)] * p[val][__builtin_ctz(mask)];
  16. 		if (sign < 0)
  17. 			cnt[mul[mask]]--;
  18. 		if (__builtin_popcount(mask) & 1)
  19. 			ans -= cnt[mul[mask]] * sign;
  20. 		else
  21. 			ans += cnt[mul[mask]] * sign;
  22. 		if (sign > 0)
  23. 			cnt[mul[mask]]++;
  24. 	}
  25. }
  26. int main()
  27. {
  28. 	ios::sync_with_stdio(false);
  29. 	for (int i = 2; i < MAX; i++)
  30. 		if (p[i].empty())
  31. 			for (int j = i; j < MAX; j += i)
  32. 				p[j].push_back(i);
  33. 	int n, q;
  34. 	cin >> n >> q;
  35. 	for (int i = 0; i < n; i++)
  36. 	{
  37. 		cin >> a[i];
  38. 		has[i] = 1;
  39. 	}
  40. 	while (q--)
  41. 	{
  42. 		int x;
  43. 		cin >> x;
  44. 		x--;
  45. 		add(a[x], has[x]);
  46. 		has[x] *= -1;
  47. 		cout << ans << '\n';
  48. 	}
  49. 	return 0;
  50. }
  51.  
Runtime error #stdin #stdout 0.27s 28432KB
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https://ideone.com/dQcpTQ
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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