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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6.  
  7.  
  8. const int M = 1000000007;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b, int mod=M) {
  14.     int x = 1;
  15.     a %= mod;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % mod; 
  18.         a = (a * a) % mod;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27.  
  28.  
  29.  
  30. vector<int> a;
  31.  
  32.  
  33. int consistency(int n, int k){
  34.  
  35. 	sort(begin(a), end(a));
  36.  
  37. 	int ans = 0;
  38. 	int s = 0, e = 0;
  39.  
  40. 	while(e<n && s<n-1){
  41. 		if(s==e) e++;
  42.  
  43. 		if(a[e]-a[s] > k){
  44. 			s++;
  45. 		}
  46. 		else if(a[e] - a[s] < k){
  47. 			e++;
  48. 		}
  49. 		else{
  50. 			int x = a[s];
  51. 			int ct1 = 0;
  52. 			while(s<e && a[s] == x){
  53. 				ct1++;
  54. 				s++;
  55. 			}
  56.  
  57. 			int y = a[e];
  58. 			int ct2 = 0;
  59. 			while(e<n && a[e] == y){
  60. 				ct2++;
  61. 				e++;
  62. 			}
  63.  
  64. 			ans += ct1*ct2;
  65. 		}
  66. 	}
  67. 	return ans;
  68. }
  69.  
  70.  
  71.  
  72.  
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  74.  
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  78.  
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  80.  
  81.  
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  86.  
  87.  
  88.  
  89.  
  90.  
  91. int practice(int n){
  92.  
  93.  
  94.     return 0;
  95. }
  96.  
  97.  
  98.  
  99.  
  100.  
  101. void solve() {
  102.  
  103.     int n, k;
  104.     cin>> n >> k;
  105.  
  106.     a.resize(n);
  107.     for(int i=0; i<n; i++) cin >> a[i];
  108.  
  109.     cout << consistency(n, k) << endl;
  110.  
  111.  
  112. }
  113.  
  114.  
  115.  
  116.  
  117.  
  118. int32_t main() {
  119.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  120.  
  121.     int t = 1;
  122.     // cin >> t;
  123.     while (t--) {
  124.         solve();
  125.     }
  126.  
  127.     return 0;
  128. }
Success #stdin #stdout 0s 5308KB
comments (?)
stdin 
16 2
1 1 1 2 2 4 4 4 4 4 4 6 6 7 7 8
stdout 
26
https://ideone.com/y2auX0
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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