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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. bool fun(vector<int> nums, int k) {
  5.     unordered_map<int, int> mpp;
  6.  
  7.     for (int i = 0; i < nums.size(); i++) {
  8.  
  9.         if (mpp.find(nums[i]) != mpp.end()) {
  10.             int lastIndex = mpp[nums[i]];
  11.             int distance = i - lastIndex;
  12.  
  13.             if (distance <= k)
  14.                 return true;
  15.         }
  16.  
  17.         mpp[nums[i]] = i;
  18.     }
  19.  
  20.     return false;
  21. }
  22.  
  23. int main() {
  24.     vector<int> nums = {1, 2, 2, 1, 2, 3};
  25.     int k = 2;
  26.  
  27.     cout << fun(nums, k);
  28.  
  29.     return 0;
  30. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/nPm7cS
language:
C++ (gcc 8.3)
created:
20 hours ago
visibility:
public

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