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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. int consistency(int n, int k){
  33.  
  34. 	unordered_map<int,int> mp;
  35. 	for(int i=0; i<n; i++) mp[a[i]]++;
  36.  
  37. 	unordered_set<int> st;
  38. 	int ans = 0;
  39. 	for(int i=0; i<n; i++){
  40.  
  41. 		if( !st.count(a[i]) ){
  42. 			if(k==0){
  43. 				if(mp[ a[i] ] > 1) ans++;
  44. 			}
  45. 			else{
  46. 				if( mp.count(a[i] - k) ) ans++; 
  47. 			}
  48. 		}
  49.  
  50. 		st.insert( a[i] );
  51. 	}
  52.  
  53. 	return ans;
  54. }
  55.  
  56.  
  57.  
  58.  
  59.  
  60.  
  61.  
  62.  
  63.  
  64.  
  65.  
  66.  
  67.  
  68.  
  69.  
  70. int practice(int n, int k){
  71.  
  72.  
  73.     return 0;
  74. }
  75.  
  76.  
  77.  
  78.  
  79.  
  80. void solve() {
  81.  
  82.     int n, k;
  83.     cin>> n >> k;
  84.  
  85.     a.resize(n);
  86.     for(int i=0; i<n; i++) cin >> a[i];
  87.  
  88.     cout << consistency(n, k) << endl;
  89.  
  90.  
  91. }
  92.  
  93.  
  94.  
  95.  
  96.  
  97. int32_t main() {
  98.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  99.  
  100.     int t = 1;
  101.     cin >> t;
  102.     while (t--) {
  103.         solve();
  104.     }
  105.  
  106.     return 0;
  107. }
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin
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4
4 1
1 1 1 2
8 1
1 1 1 2 2 2 1 2
2 0
1 2
3 0
1 1 2
stdout
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1
1
0
1
https://ideone.com/uqMdNb
language:
C++14 (gcc 8.3)
created:
16 hours ago
visibility:
public

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