{"componentChunkName":"component---src-templates-blog-post-js","path":"/Problem-Solving/2020-01-14-11004๋ฒˆ-K๋ฒˆ์งธ-์ˆ˜/","result":{"data":{"site":{"siteMetadata":{"title":"Hun's Footsteps ๐Ÿฅท","author":"์ „์—ฌํ›ˆ","siteUrl":"https://jeonyeohun.netlify.app","comment":{"disqusShortName":"","utterances":"jeonyeohun/jeonyeohun.github.io"},"sponsor":{"buyMeACoffeeId":"jeonyeohun"}}},"markdownRemark":{"id":"0a95b951-7c65-5886-872b-666f4bad10a0","excerpt":"11004๋ฒˆ: K๋ฒˆ์งธ ์ˆ˜ ์ ‘๊ทผ ๋ฐฉ๋ฒ•: c++์—์„œ ์ง€์›ํ•˜๋Š” nth_element ํ•ฉ์ˆ˜๋ฅผ ํ†ตํ•ด ํ•ด๊ฒฐํ–ˆ๋‹ค. ์ด ํ•จ์ˆ˜๋Š” quick selection์ด๋ผ๋Š” ์•Œ๊ณ ๋ฆฌ์ฆ˜์„ ์‚ฌ์šฉํ•˜๋Š”๋ฐ, ํ€ต์†ŒํŠธ์™€ ์…€๋ ‰์…˜ ์†ŒํŠธ ์•Œ๊ณ ๋ฆฌ์ฆ˜์˜ ์ปจ์…‰์„ ํ•ฉ์ณ์„œ ๋งŒ๋“  ์•Œ๊ณ ๋ฆฌ์ฆ˜์ด๋‹ค. ๋”ฐ๋กœ ๊ณต๋ถ€๊ฐ€ ํ•„์š”ํ•ด ๋ณด์ธ๋‹ค. ํ†ต๊ณผ ์ฝ”๋“œ:","html":"

11004๋ฒˆ: K๋ฒˆ์งธ ์ˆ˜

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๋ฌธ์ œ\n์ˆ˜ N๊ฐœ A1, A2, ..., AN์ด ์ฃผ์–ด์ง„๋‹ค. A๋ฅผ ์˜ค๋ฆ„์ฐจ์ˆœ ์ •๋ ฌํ–ˆ์„ ๋•Œ, ์•ž์—์„œ๋ถ€ํ„ฐ K๋ฒˆ์งธ ์žˆ๋Š” ์ˆ˜๋ฅผ ๊ตฌํ•˜๋Š” ํ”„๋กœ๊ทธ๋žจ์„ ์ž‘์„ฑํ•˜์‹œ์˜ค.\n\n์ž…๋ ฅ\n์ฒซ์งธ ์ค„์— N(1 โ‰ค N โ‰ค 5,000,000)๊ณผ K (1 โ‰ค K โ‰ค N)์ด ์ฃผ์–ด์ง„๋‹ค.\n\n๋‘˜์งธ์—๋Š” A1, A2, ..., AN์ด ์ฃผ์–ด์ง„๋‹ค. (-109 โ‰ค Ai โ‰ค 109)\n\n์ถœ๋ ฅ\nA๋ฅผ ์ •๋ ฌํ–ˆ์„ ๋•Œ, ์•ž์—์„œ๋ถ€ํ„ฐ K๋ฒˆ์งธ ์žˆ๋Š” ์ˆ˜๋ฅผ ์ถœ๋ ฅํ•œ๋‹ค
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์ ‘๊ทผ ๋ฐฉ๋ฒ•:

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c++์—์„œ ์ง€์›ํ•˜๋Š” nth_element ํ•ฉ์ˆ˜๋ฅผ ํ†ตํ•ด ํ•ด๊ฒฐํ–ˆ๋‹ค. ์ด ํ•จ์ˆ˜๋Š” quick selection์ด๋ผ๋Š” ์•Œ๊ณ ๋ฆฌ์ฆ˜์„ ์‚ฌ์šฉํ•˜๋Š”๋ฐ, ํ€ต์†ŒํŠธ์™€ ์…€๋ ‰์…˜ ์†ŒํŠธ ์•Œ๊ณ ๋ฆฌ์ฆ˜์˜ ์ปจ์…‰์„ ํ•ฉ์ณ์„œ ๋งŒ๋“  ์•Œ๊ณ ๋ฆฌ์ฆ˜์ด๋‹ค. ๋”ฐ๋กœ ๊ณต๋ถ€๊ฐ€ ํ•„์š”ํ•ด ๋ณด์ธ๋‹ค.

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ํ†ต๊ณผ ์ฝ”๋“œ:

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#include <iostream>\n#include <algorithm>\n#include <vector>\n\nusing namespace std;\n\nint main (){\n    ios_base::sync_with_stdio(0);\n    cin.tie(0);\n\n    int A, N;\n    cin >> A >> N;\n    vector<int> v;\n    while(A--){\n        int n;\n        cin >> n;\n        v.push_back(n);\n    }\n    nth_element(v.begin(), v.begin()+N-1, v.end());\n\n    cout << v[N-1];\n}
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