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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7. 	ll p, n;
  8. 	unordered_set<ll> marked;
  9. 	marked.insert(0);
  10.  
  11. 	cin >> p >> n;
  12.  
  13. 	ll sum = 0;
  14. 	for(int i = 1; i <= min(p * 2, n); i++) {
  15. 		sum = (sum + i) % p;
  16. 		marked.insert(sum);
  17. 	}
  18.  
  19. 	cout << marked.size() << endl;
  20.  
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 15240KB
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stdin
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8 1000000000000000000
stdout
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8
https://ideone.com/hJpngs
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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