题解 | #数据分类处理#
数据分类处理
https://www.nowcoder.com/practice/9a763ed59c7243bd8ab706b2da52b7fd
I = input().split()
R = input().split()
I_arr = I[1: int(I[0])+1]
R_arr = sorted(list(set([int(x) for x in R[1:int(R[0])+1]])))
out = []
for ri in R_arr:
p = [[i,x] for i,x in enumerate(I_arr) if str(ri) in x]
if len(p) >0:
out = out + [str(ri),str(len(p))]+[str(element) for row in p for element in row]
print(len(out),' '.join(out))
