[Algorithm] H-Index

[hwangJi-dev]

💬 문제

https://school.programmers.co.kr/learn/courses/30/lessons/42747#fn1

💬 풀이

func solution(citations:[Int]) -> Int {
    var HIndex = 0

    for i in 0..<citations.max()! {
        let up = citations.filter({ $0 >= i }).count
        let down = citations.filter({ $0 < i }).count

        if up >= i && down <= i {
            HIndex = max(HIndex, i)
        }
    }

    return HIndex
}

💬 더 나은 방법?

func solution(citations:[Int]) -> Int {
    let citations = citations.sorted(by: >)
    var ans = 0
    
    for i in 0..<citations.count {
        if i + 1 <= citations[i] {
            ans = i + 1
        } else {
            break
        }
    }
    
    return ans
}