노트

import sys sys.setrecursionlimit(10 ** 6) a,b = map(int,input().split()) boss = list(map(int,input().split())) gujo = [[] for _ in range(a)] my_boss = [0]*(a+1) ans = [0]*(a+1) for i in range(1,a): if boss[i]!=-1: gujo[boss[i]].append(i+1) my_boss[i+1]=boss[i] def tamsaek(k): ans[k] += ans[my_boss[k]] if k