https://school.programmers.co.kr/learn/courses/30/lessons/138476
from collections import Counter
def solution(k, tangerine):
answer = 0
counter=Counter(tangerine)
count=sorted(counter.items(),key=lambda x:x[1],reverse=True)
for i in count:
if k<=0:
break
k-=i[1]
answer+=1
return answer
count=sorted(counter.items(),key=lambda x:x[1],reverse=True)
x[1]은 value를 의미
key 로 하려면 x[0]