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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. bool checkDuplicate(vector<int>& a, int k) {
  5.     unordered_map<int, int> mpp;  // Stores the last index of each element
  6.  
  7.     for (int i = 0; i < a.size(); i++) {
  8.         if (mpp.count(a[i]) && abs(mpp[a[i]] - i) <= k) {
  9.             return true;
  10.         }
  11.         mpp[a[i]] = i; // Update the last occurrence index
  12.     }
  13.     return false;
  14. }
  15.  
  16. int main() {
  17.     int n;
  18.     cin >> n;
  19.     vector<int> arr(n);
  20.  
  21.     for (int i = 0; i < n; i++) {
  22.         cin >> arr[i];
  23.     }
  24.  
  25.     int k;
  26.     cin >> k;
  27.  
  28.     cout << (checkDuplicate(arr, k) ? "True" : "False");
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0.01s 5280KB
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7
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True
https://ideone.com/IXX8tr
language:
C++ (gcc 8.3)
created:
40 days ago
visibility:
public

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