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solution Container Duplicate (#217)
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/**
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* ๋ฐฐ์—ด์— ์ค‘๋ณต๋œ ์š”์†Œ๊ฐ€ ์žˆ๋Š”์ง€ ํ™•์ธํ•˜๋Š” ํ•จ์ˆ˜
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* @param nums - ํ™•์ธํ•  ์ •์ˆ˜ ๋ฐฐ์—ด
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* @returns ์ค‘๋ณต๋œ ์š”์†Œ๊ฐ€ ์žˆ์œผ๋ฉด true, ๋ชจ๋“  ์š”์†Œ๊ฐ€ ๊ณ ์œ ํ•˜๋ฉด false
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*
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* ๊ธฐ์กด์— for๋ฌธ์„ ์‚ฌ์šฉํ•ด filter,indexOf ๋ฐฉ์‹์„ ์‚ฌ์šฉํ–ˆ์ง€๋งŒ, ์‹œ๊ฐ„๋ณต์žก๋„๊ฐ€ O(n^2)์ด๋ผ์„œ ์‹œ๊ฐ„์ดˆ๊ณผ๊ฐ€ ๋ฐœ์ƒํ–ˆ๋‹ค.
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* Set์„ ์‚ฌ์šฉํ•˜๋ฉด ์ค‘๋ณต๋œ ์š”์†Œ๋ฅผ ์ œ๊ฑฐํ•˜๊ณ , size๋ฅผ ํ†ตํ•ด ์ค‘๋ณต๋œ ์š”์†Œ๊ฐ€ ์žˆ๋Š”์ง€ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.
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*/
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function containsDuplicate(nums: number[]): boolean {
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return new Set(nums).size !== nums.length
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};

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