Leetcode Problem 1814. Count Nice Pairs in an Array

1814. Count Nice Pairs in an Array

Leetcode Solutions

Counting Nice Pairs Using Hash Map

  1. Define a function rev that reverses the digits of a given integer.
  2. Initialize an empty hash map dic to store the counts of each difference and a variable ans to store the number of nice pairs.
  3. Iterate over the input array nums and for each element num, calculate diff = num - rev(num).
  4. For each diff, add the count of diff from the hash map to ans (since each previous occurrence of diff can form a nice pair with the current one).
  5. Increment the count of diff in the hash map.
  6. Return the final count of nice pairs ans modulo 10^9 + 7.
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Brute Force Comparison of Pairs

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