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  1. #include<bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #define int    long long int
  5.  
  6. // ============================================================================================================
  7.  
  8.  
  9. int subset(int *arr, int i, int size) {
  10. 	int sum = 0;
  11. 	size -= 1;
  12. 	while (i) {
  13. 		if (i & 1) {
  14. 			sum += arr[size];
  15. 		}
  16. 		size--;
  17. 		i = i >> 1;
  18. 	}
  19. 	return sum;
  20.  
  21. }
  22.  
  23.  
  24. int32_t main() {
  25.  
  26. 	int n, a, b, val;
  27. 	cin >> n >> a >> b;
  28. 	int arr[n];
  29. 	for(int i = 0;i<n;++i) {
  30. 		cin >> arr[i];
  31. 	}
  32. 	int range = 1 << n;
  33. 	int count = 0;
  34. 	for(int i = 1;i<range;++i) {
  35. 		val = subset(arr, i, n);
  36. 		if (( val >= a) && (val <= b)) {
  37. 			count++;
  38. 		}
  39. 	}
  40. 	if ((a <= 0) && (b >= 0)) {
  41. 		count++;
  42. 	}
  43. 	cout << count;
  44. 	return 0;
  45. }
  46.  
Success #stdin #stdout 0s 4364KB
comments (?)
stdin 
3 -1 2
1
-2
3
stdout 
5
https://ideone.com/UYyhLI
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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