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Count the number of index pairs i<j such that hours[i] + hours[j] is a multiple of 24 — equivalently, whose remainders modulo 24 sum to 0 mod 24. This is a remainder-frequency / complementary-pair counting problem (n ≤ 100, values up to 1e9).
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Leetcode 3184. Count Pairs That Form a Complete Day I
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