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347. Top K Frequent Elements
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top-k-frequent-elements/y00eunji.js

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*/
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var topKFrequent = function(nums, k) {
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// 1. nums 배열을 순회하여 각 숫자의 빈도를 계산하고 obj 객체에 저장
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const obj = nums.reduce((arr, idx) => {
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arr[idx] = (arr[idx] || 0) + 1;
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return arr;
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const obj = nums.reduce((acc, cur) => {
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acc[cur] = (acc[cur] || 0) + 1;
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return acc;
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}, {});
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// 2. obj 객체의 키-값 쌍을 배열로 변환하고, 값을 기준으로 내림차순 정렬, k개 추출

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