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[๋ธŒ๋ก ์ฆˆ3][Swift]๋ฐฑ์ค€5597(๋ฐฐ์—ด)

BreadDev 2024. 10. 7. 09:24
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https://www.acmicpc.net/problem/5597

 

๋‹ต์•ˆ์ฝ”๋“œ

var students = Array(repeating: false, count: 31)

for _ in 1...28 {
    if let input = readLine(), let number = Int(input) {
        students[number] = true
    }
}

for i in 1...30 {
    if !students[i] {
        print(i)
    }
}
  • 31๊ฐœ์˜ false ๊ฐ’์„ ๊ฐ€์ง„ ๋ฐฐ์—ด์„ ์ƒ์„ฑํ•ฉ๋‹ˆ๋‹ค (0๋ฒˆ ์ธ๋ฑ์Šค๋Š” ์‚ฌ์šฉํ•˜์ง€ ์•Š์Œ).
  • 28๋ฒˆ ๋ฐ˜๋ณตํ•˜๋ฉด์„œ ์ž…๋ ฅ๋ฐ›์€ ๋ฒˆํ˜ธ์— ํ•ด๋‹นํ•˜๋Š” ์ธ๋ฑ์Šค๋ฅผ true๋กœ ๋ณ€๊ฒฝํ•ฉ๋‹ˆ๋‹ค.
  • 1๋ถ€ํ„ฐ 30๊นŒ์ง€ ์ˆœํšŒํ•˜๋ฉด์„œ false์ธ ์ธ๋ฑ์Šค(์ฆ‰, ์ œ์ถœํ•˜์ง€ ์•Š์€ ํ•™์ƒ์˜ ๋ฒˆํ˜ธ)๋ฅผ ์ถœ๋ ฅํ•ฉ๋‹ˆ๋‹ค.
์ด ๋ฌธ์ œ๋Š” Boolean ๋ฐฐ์—ด์„ ์‚ฌ์šฉํ•ด์„œ ์ถœ์„์—ฌ๋ถ€๋ฅผ ํ‘œ์‹œํ–ˆ๊ณ ,
๋‘ ์ง‘ํ•ฉ๊ณผ์˜ ์ฐจ์ด๋ฅผ ํ†ตํ•ด ํ•ด๊ฒฐํ•˜์˜€์Šต๋‹ˆ๋‹ค. (์ „์ฒด ํ•™์ƒ ์ง‘ํ•ฉ(1~30)๊ณผ ์ œ์ถœํ•œ ํ•™์ƒ ์ง‘ํ•ฉ์˜ ์ฐจ์ด)