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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. inline int power(int a, int b) {
  6.     int x = 1;
  7.     while (b) {
  8.         if (b & 1) x *= a;
  9.         a *= a;
  10.         b >>= 1;
  11.     }
  12.     return x;
  13. }
  14.  
  15.  
  16. const int M = 1000000007;
  17. const int N = 3e5+9;
  18. const int INF = 2e9+1;
  19. const int LINF = 2000000000000000001;
  20.  
  21. //_ ***************************** START Below *******************************
  22.  
  23. // 5 2
  24. // 1 5 3 4 2
  25.  
  26. vector<int> a;
  27. int consistency(int n, int k) {
  28.  
  29. 	unordered_map<int,int> mp;
  30. 	int ans = 0;
  31. 	for(int i=0; i<n; i++){
  32. 		if(mp.count(a[i] + k)){
  33. 			ans += mp[a[i] + k];
  34. 		}
  35. 		mp[a[i]]++;
  36. 	}
  37.  
  38. 	return ans;
  39. }
  40.  
  41.  
  42.  
  43.  
  44.  
  45.  
  46.  
  47.  
  48.  
  49.  
  50.  
  51.  
  52.  
  53.  
  54. int practice(int n, int k) {
  55.  
  56. 	int ans = 0;
  57.  
  58. 	unordered_map<int,int> mp;
  59.  
  60. 	for(int i=0; i<n; i++){
  61. 		if(mp.count(k+a[i])){
  62. 			ans += mp[k+a[i]];
  63. 		}
  64. 		mp[a[i]]++;
  65. 	}
  66.  
  67. 	return ans;
  68.  
  69. }
  70.  
  71. void solve() {
  72.  
  73.     int n, k;
  74.     cin >> n >> k;
  75.     a.resize(n);
  76.     for(int i=0; i<n; i++) cin >> a[i];
  77.  
  78.     cout << consistency(n, k) << endl ;
  79.  
  80.  
  81.     // cout << consistency(n, k) << " -> " << practice(n, k) << endl ;
  82.  
  83. }
  84.  
  85.  
  86.  
  87.  
  88.  
  89. int32_t main() {
  90.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  91.  
  92.     int t = 1;
  93.     while (t--) {
  94.         solve();
  95.     }
  96.  
  97.     return 0;
  98. }
Success #stdin #stdout 0s 5316KB
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stdin
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5 2
1 5 3 4 2
stdout
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2
https://ideone.com/KPHiQX
language:
C++14 (gcc 8.3)
created:
1 hour ago
visibility:
public

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