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2022 KAKAO TECH INTERNSHIP4

[Swift] 2022 KAKAO TECH INTERNSHIP ๋“ฑ์‚ฐ์ฝ”์Šค ์ •ํ•˜๊ธฐ Problem ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr Solution ํ•ด๋‹น ๋ฌธ์ œ๋Š” BFS ํ˜น์€ ๋‹ค์ต์ŠคํŠธ๋ผ๋ฅผ ์ด์šฉํ•˜์—ฌ ํ’€์–ด์•ผ ํ•˜๋Š” ๋ฌธ์ œ์ž…๋‹ˆ๋‹ค. 1. ํ˜„์žฌ ๊ฒฝ๋กœ์˜ ์ตœ๋Œ€ intensity์™€ ํ˜„์žฌ ์ง€์ ์˜ ์ •๋ณด๋ฅผ ๊ฐ–๋Š” Node๋ฅผ ๋งŒ๋“ค์–ด ์ค€๋‹ค. struct Node { let current: Int let maxIntensity: Int } 2. ํ•„์š”ํ•œ ๋ณ€์ˆ˜๋“ค์„ ์„ธํŒ…ํ•ด ์ค€๋‹ค. answer: ๊ฐ€์žฅ ์ ์€ intensity์˜ ์‚ฐ๋ด‰์šฐ๋ฆฌ์™€ ๊ฐ’์„ ์ €์žฅํ•  ๋ณ€์ˆ˜ connection: path์˜ ์—ฐ๊ฒฐ๋œ ์ •๋ณด๋ฅผ ์ €์žฅํ•  ๋ณ€์ˆ˜ summitDic: ์‚ฐ๋ด‰์šฐ๋ฆฌ๋ฅผ ์ €์žฅํ•  ๋”•์…”๋„ˆ๋ฆฌ gat.. 2022. 8. 29.
[Swift] 2022 KAKAO TECH INTERNSHIP ์ฝ”๋”ฉ ํ…Œ์ŠคํŠธ ๊ณต๋ถ€ Problem ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr Solution ํ•ด๋‹น ๋ฌธ์ œ๋Š” ๋‹ค์ด๋‚˜๋ฏน ํ”„๋กœ๊ทธ๋ž˜๋ฐ์œผ๋กœ ํ’€์–ด์•ผ ํ•˜๋Š” ๋ฌธ์ œ์ด๋‹ค. 1. ์•Œ๊ณ ๋ ฅ๊ณผ ์ฝ”๋”ฉ๋ ฅ์˜ ์ตœ๋Œ€์น˜๋ฅผ ๊ตฌํ•ด์ค€๋‹ค. ๋ฌธ์ œ๋ฅผ ๋ชจ๋‘ ํ’€ ์ˆ˜ ์žˆ๋‹ค๋Š” ๊ฒƒ์€ ์•Œ๊ณ ๋ ฅ๊ณผ ์ฝ”๋”ฉ๋ ฅ์˜ ์ตœ๋Œ€์น˜๋ฅผ ์–ป๋Š” ๋‹ค๋Š” ๊ฒƒ์ด๋ฏ€๋กœ ๋ฏธ๋ฆฌ ๊ตฌํ•ด์ค€๋‹ค. var maxAlp: Int = alp var maxCop: Int = cop problems.forEach { maxAlp = max(maxAlp,$0[0]) maxCop = max(maxCop,$0[1]) } 2. dp ๋ฐฐ์—ด์„ ์•Œ๊ณ ๋ ฅ + 1 , ์ฝ”๋”ฉ๋ ฅ + 1๊ฐœ์˜ ์ด์ค‘ ๋ฐฐ์—ด์„ ๋งŒ๋“ค์–ด .. 2022. 8. 26.
[Swift] 2022 KAKAO TECH INTERNSHIP ๋‘ ํ ํ•ฉ ๊ฐ™๊ฒŒ ๋งŒ๋“ค๊ธฐ Problem ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr Solution ๋‚˜๋Š” ์ด๋ฒˆ ๋ฌธ์ œ๋ฅผ ์Šฌ๋ผ์ด๋”ฉ ์œˆ๋„์šฐ(Sliding-Window)๋ฅผ ์ด์šฉํ•ด์„œ ํ’€์—ˆ๋‹ค. 1. ํ•„์š”ํ•œ ๋ณ€์ˆ˜๋ฅผ ์„ธํŒ…ํ•œ๋‹ค. cumulativeSum: ๋ˆ„์ ํ•ฉ์„ ๋‹ด์„ ๋ฐฐ์—ด q1Length: queue1์˜ ๊ธธ์ด q2Length: queue2์˜ ๊ธธ์ด answer: ๊ฐ€์žฅ ์ ์€ ์ž‘์—… ํšŸ์ˆ˜๋ฅผ ๊ธฐ๋กํ•  ๋ณ€์ˆ˜ start: ์Šฌ๋ผ์ด๋”ฉ ์œˆ๋„์šฐ์—์„œ ์‹œ์ž‘ ์ง€์ ์„ ๊ฐ€๋ฅดํ‚ฌ ๋ณ€์ˆ˜ var cumulativeSum: [Int] = [0] let q1Length: Int = queue1.count let q2Length: I.. 2022. 8. 24.
[Swift] 2022 KAKAO TECH INTERNSHIP ์„ฑ๊ฒฉ ์œ ํ˜• ๊ฒ€์‚ฌํ•˜๊ธฐ Problem ํ•œ ๋™์•ˆ ๋ฆฟ์ฝ”๋“œ๋งŒ ํ’€๋‹ค๊ฐ€ ์ •๋ง ์˜ค๋žœ๋งŒ์— ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค๋ฅผ ๋“ค์–ด๊ฐ”๋”๋‹ˆ ์ƒˆ๋กœ์šด ์นด์นด์˜ค ๋ฌธ์ œ๊ฐ€ ์žˆ์–ด์„œ ํ•œ๋ฒˆ ํ’€์–ด๋ดค๋‹ค. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr Solution 1. ์ฃผ์–ด์ง„ ์„ฑ๊ฒฉ ์•ŒํŒŒ๋ฒณ์„ ๋”•์…”๋„ˆ๋ฆฌ๋กœ ๋งŒ๋“ค์–ด ์ค€๋‹ค. var charDic: [Character:Int] = ["R":0,"T":0,"C":0,"F":0,"J":0,"M":0,"A":0,"N":0] 2. survey๋ฅผ ์ˆœํšŒํ•˜๋ฉฐ choice์˜ ๊ฐ’์— ๋งž๊ฒŒ ์ฒซ ๋ฒˆ์งธ ๋˜๋Š” ๋‘ ๋ฒˆ์งธ ์บ๋ฆญํ„ฐ์— ๊ฐ’์„ ๋”ํ•ด์ค€๋‹ค. ๋งŒ์•ฝ choices์˜ i๋ฒˆ์งธ ๊ฐ’์ด 4๋ณด๋‹ค ์ž‘๋‹ค๋ฉด ์ฒซ ๋ฒˆ์งธ ๊ธ€์ž์— 4์—์„œ ํ•ด๋‹น.. 2022. 8. 23.
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