Can Array Pairs Be Divisible By K In O(n) Time?
Check if array pairs are divisible by k: use frequency count of remainders and check pairing conditions for efficient solution in O(n) time complexity.
1497. Check If Array Pairs Are Divisible by k Difficulty: Medium Topics: Array, Hash Table, Counting Given an array of integers arr of even length n and an integer k. We want to divide the array into exactly n / 2 pairs such that the sum of each pair is divisible by k. Return true If you can find a way to do that or false otherwise. Example 1: Input: arr = [1,2,3,4,5,10,6,7,8,9], k = 5 Output: true Explanation: Pairs are (1,9),(2,8),(3,7),(4,6) and (5,10). Example 2: Input: arr = [1,2,3,4,5,6], k = 7 Output: true Explanation: Pairs are (1,6),(2,5) and(3,4). Example 3: Input: arr = [1,2,3,...