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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <vector>
  4. #include <queue>
  5. #include <unordered_set>
  6. #include <map>
  7. #include <utility>
  8. #include <set>
  9. #include <unordered_map>
  10. #include <climits>
  11. #include <cmath>
  12. #include <stack>
  13. #include <string>
  14. using namespace std ;
  15. #define ll long long int 
  16. #define IOS ios::sync_with_stdio(false)  ; cin.tie(0) ; cout.tie()  
  17. #define MOD  1000000007  
  18. int arr[100005] ; 
  19. //ll n  ;
  20.  
  21.  
  22. int main(){
  23.  IOS;
  24.  ll n  ,x , k;
  25.  cin>>n>>x>>k ; 
  26. for(ll i  = 0 ;  i< n ; ++i)
  27. 	{
  28. 		cin>>arr[i]; 
  29. 	}
  30. 	sort(arr , arr + n  ) ; 
  31.  
  32. ll ans = 0  ;
  33. ll modulo[n] ; 
  34. for(int i  = 0 ;  i< n ; ++i)
  35. {
  36.    modulo[i]  = arr[i] / x  ;
  37. }
  38.  
  39. for(int  i  = 0 ; i< n  ;++i)
  40. {
  41. 	  if(arr[i] % x != 0){
  42. 	  auto k1 = lower_bound(modulo  , modulo + n  ,  modulo[i] + k) ; 
  43. 	  auto k2 = upper_bound(modulo  , modulo + n  ,  modulo[i] + k) ; 
  44. 	  ans +=  (k2 - k1 ); 
  45.  
  46. 	}
  47. 	else
  48. 	{
  49. 		auto k1 = lower_bound(modulo  , modulo + n  ,  modulo[i] + k -1) ; 
  50. 	  auto k2 = upper_bound(modulo  , modulo + n  ,  modulo[i] + k -1) ; 
  51. 	  ans +=  (k2 - k1) ; 
  52.  
  53.  
  54. 	}
  55. }
  56.  
  57.  
  58. cout<<ans ; 
  59.  
  60. return   0 ;
  61. }
Success #stdin #stdout 0s 15632KB
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https://ideone.com/dIQKbm
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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