Leetcode Problem 1497. Check If Array Pairs Are Divisible by k

1497. Check If Array Pairs Are Divisible by k

Leetcode Solutions

Remainder Frequency Matching

  1. Initialize a frequency array frequency of size k to store the count of each remainder.
  2. Iterate over each element num in arr: a. Calculate the remainder rem of num when divided by k. b. If rem is negative, add k to it to make it positive. c. Increment the count of rem in the frequency array.
  3. Check if the frequency of 0 is even. If not, return false.
  4. Iterate from i = 1 to k/2: a. Check if frequency[i] is equal to frequency[k-i]. If not, return false.
  5. If all checks pass, return true.
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Two Pointer Approach

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