H-index -python(programmers)

H-index

-->https://programmers.co.kr/learn/courses/30/lessons/42747

def solution(citations):
    answer=0
    citations = sorted(citations)
    
    for i in range(0,max(citations)+1):
        if i<=len(list(filter(lambda x : x>=i ,citations))):
            answer=i
    return answer