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Given a list of items where each item is [type, color, name] and a ruleKey (type/color/name) plus ruleValue, return how many items have the corresponding field equal to ruleValue. This reduces to mapping ruleKey to a field index and performing a linear scan to count matches (O(n), n ≤ 10^4).
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Leetcode 1773. Count Items Matching a Rule
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