[swift] 프로그래머스 - 귤 고르기

프로그래머스

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풀이

func solution(_ k: Int, _ tangerine: [Int]) -> Int {
    var a = Dictionary(grouping: tangerine, by: { $0 } ).values.sorted(by: { $0.count > $1.count }).map { $0.count }
    var sum = 0, count = 0
    for i in a {
        if sum < k { sum += i; count += 1 }
        else { break }
    }
    return count
}

func solution(_ k: Int, _ tangerine: [Int]) -> Int {
    return Dictionary(grouping: tangerine) { $0 }.values
        .sorted { $0.count > $1.count }
        .reduce((0,0)) { $0.1 >= k ? $0 : ($0.0 + 1, $0.1 + $1.count) }.0
}

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