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[Grit03] WEEK 01 solutions #1725

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Jul 26, 2025
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[Grit03] WEEK 01 solutions #1725

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22 changes: 22 additions & 0 deletions contains-duplicate/Grit03.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
/**
* @param {number[]} nums
* @return {boolean}
*/
var containsDuplicate = function (nums) {
const countMap = new Map();
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Set 자료구조를 사용해보는 건 어떨까요?
참고자료 첨부드립니다! https://www.algodale.com/problems/contains-duplicate/#%ED%92%80%EC%9D%B4-3

한 주간 고생많으셨어요 🙌


for (let i = 0; i < nums.length; i++) {
const key = nums[i];
if (countMap.has(key)) {
const value = countMap.get(key);
if (value === 1) {
return true;
}
countMap.set(key, value + 1);
} else {
countMap.set(key, 1);
}
}

return false;
};