Leetcode Problem 2006. Count Number of Pairs With Absolute Difference K

2006. Count Number of Pairs With Absolute Difference K

Leetcode Solutions

Using a HashMap to Count Pairs with Absolute Difference K

  1. Initialize a HashMap to store the frequency of each number in the nums array.
  2. Iterate over the nums array and populate the HashMap with the frequency of each number.
  3. Initialize a variable count to store the number of valid pairs.
  4. Iterate over the nums array again.
  5. For each number, check if the number k units less (num - k) is in the HashMap and add its frequency to count.
  6. Check if the number k units more (num + k) is in the HashMap and add its frequency to count.
  7. Since each pair will be counted twice, divide the final count by 2 before returning it.
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Brute Force Approach

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