Leetcode 1497. Check If Array Pairs Are Divisible by k

Determine whether the array can be paired so every pair sums to a multiple of k by looking at element remainders mod k: you must be able to match counts of remainder r with counts of k−r (and ensure counts for remainder 0 — and r = k/2 when k is even — are even), accounting for negative values via modulo normalization.

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Leetcode 1497. Check If Array Pairs Are Divisible by k

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