Leetcode Problem 2364. Count Number of Bad Pairs

2364. Count Number of Bad Pairs

Leetcode Solutions

Counting Good Pairs to Find Bad Pairs

  1. Initialize a hashmap to store the frequency of each i - nums[i] value.
  2. Initialize a variable goodPairs to count the number of good pairs.
  3. Calculate the total number of pairs using the formula n * (n - 1) / 2, where n is the length of the array.
  4. Iterate through the array nums: a. For each index i, calculate difference = i - nums[i]. b. If difference is already in the hashmap, increment goodPairs by the frequency of difference. c. Increment the frequency of difference in the hashmap.
  5. Subtract goodPairs from the total number of pairs to get the count of bad pairs.
  6. Return the count of bad pairs.
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Brute Force Pair Comparison

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