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  1. // One zero, by Errichto
  2. // O(log^2(n))
  3. #include<bits/stdc++.h>
  4. using namespace std;
  5.  
  6. int main() {
  7. 	long long a, b;
  8. 	scanf("%lld%lld", &a, &b);
  9. 	int c = 0;
  10. 	for(int i = 0; (1LL << i) / 2 <= b; ++i)
  11. 		for(int j = 0; j <= i - 2; ++j) {
  12. 			long long x = (1LL << i) - 1 - (1LL << j);
  13. 			c += a <= x && x <= b;
  14. 		}
  15. 	printf("%d\n", c);
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 3464KB
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stdin 
Standard input is empty
stdout 
1711
https://ideone.com/Kfu8sF
One zero
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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