프로그래머스 Lv.1| Python - 체육복
풀이(
def solution(n, lost, reserve):
set_r = set(reserve)-set(lost)
set_l = set(lost)-set(reserve)
for i in set_r:
if i-1 in set_l:
set_l.remove(i-1)
elif i+1 in set_l:
set_l.remove(i+1)
return n-len(set_l)