Leetcode 3153. Sum of Digit Differences of All Pairs

Given an array of equal-length positive integers, return the total number of digit positions that differ across all unordered pairs of numbers. The core challenge is to aggregate per-digit-position frequencies (digits 0–9) to count mismatching pairs efficiently for n up to 1e5.

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Leetcode 3153. Sum of Digit Differences of All Pairs

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