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  1. #include <bits/stdc++.h>
  2. #include <ext/pb_ds/assoc_container.hpp>
  3.  
  4. using namespace std;
  5. using namespace __gnu_pbds;
  6.  
  7. typedef long long ll;
  8.  
  9. gp_hash_table<ll, bool> HASH;
  10. int n;
  11. unordered_set<ll> seen;
  12. ll m, x;
  13. vector<ll> a;
  14.  
  15. int main() {
  16.     ios_base::sync_with_stdio(false);
  17.     cin.tie(NULL);
  18. 	cin >> n >> m;
  19.  
  20. 	ll k = min(m, 18000LL);
  21.  
  22. 	for(int i = 1; i <= n; i++) {
  23. 		cin >> x;
  24. 		if(x == 1) {
  25. 			cout << 0;
  26. 			return 0;
  27. 		}
  28. 		if(seen.count(x) == 0) {
  29. 		    seen.insert(x);
  30. 		    a.push_back(x);
  31. 		}
  32. 	}
  33.  
  34. 	for(int i = 0; i < a.size(); i++) {
  35. 		if(HASH.find(a[i]) != HASH.end()) continue;
  36. 		for(ll j = 1; j <= k / a[i]; j++) {
  37. 			HASH[a[i] * j] = true;
  38. 		}
  39. 	}
  40.  
  41. 	ll res = k - HASH.size();
  42. 	if(m > k) {
  43. 		res += m / 18000;
  44. 		m %= 18000;
  45.  
  46. 		HASH.clear();
  47.  
  48. 		for(int i = 0; i < a.size(); i++) {
  49. 			if(HASH.find(a[i]) != HASH.end()) continue;
  50. 			for(ll j = 1; j <= m / a[i]; j++) {
  51. 				HASH[a[i] * j] = true;
  52. 			}
  53. 		}
  54.  
  55. 		res += m - HASH.size();
  56. 	}
  57.  
  58. 	cout << res;
  59.  
  60.     return 0;
  61. }
Success #stdin #stdout 0.01s 5304KB
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https://ideone.com/wAE1NA
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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