atcoder.jp A~Cを解いた。 A S = input() if S=="ABC": print("ARC") else: print("ABC") B N,K = map(int,input().split()) O = [0]*N for k in range(K): d = int(input()) A = [int(i) for i in input().split()] for a in A: O[a-1]+=1 print(O.count(0)…