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feat: containsDuplicate 문제풀이 추가
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contains-duplicate/hwanminini.js

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// 시간복잡도: O(n)
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// 공간복잡도: O(n)
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/**
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* @param {number[]} nums
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* @return {boolean}
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*/
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var containsDuplicate = function(nums) {
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return nums.length !== new Set(nums).size
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};

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