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  1. /*
  2.     Cred : SunnyYeahBoi
  3.     It's my last chance (⌐■_■)
  4.     Problem :
  5. */
  6.  
  7. #include<bits/stdc++.h>
  8.  
  9. using namespace std;
  10.  
  11. #define int long long
  12. #define double long double
  13. #define endl "\n"
  14. #define NAME "a"
  15.  
  16. const int MAXN = 1e6 + 5;
  17. const int inf = 1e18;
  18. const int MOD = 1e9 + 7;
  19.  
  20. void FileInput(){
  21.     if(fopen(NAME".inp" , "r") == NULL)
  22.         freopen(NAME".inp" , "w" , stdout);
  23.     freopen(NAME".inp" , "r" , stdin);
  24.     freopen(NAME".out" , "w" , stdout);
  25. }
  26.  
  27. int n , k;
  28. int a[MAXN];
  29. map<int , int> mp;
  30.  
  31. void solve(){
  32.     cin >> n >> k;
  33.     for(int i = 1 ; i <= n ; i++){
  34.         cin >> a[i];
  35.         mp[a[i]]++;
  36.     }
  37.  
  38.     int res = 0;
  39.     for(auto x : mp){
  40.         int X = x.second;
  41.         int Y = mp[x.first - k];
  42.         res += X * Y;
  43.     }
  44.     cout << res << endl;
  45. }
  46.  
  47. int32_t main(){
  48.     FileInput();
  49.     ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  50.     int t = 1;
  51.     // cin >> t;
  52.     while(t--)
  53.         solve();
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout 0.01s 5268KB
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https://ideone.com/q8nNIy
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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