数据分析处理

python 16行代码搞定

while True:
    try:
        s1 = input().split()[1:]
        s2 = list(set(map(int, input().split()[1:])))
        s2.sort()
        rst = []
        for num in s2:
            tmp = []
            for i, sub in enumerate(s1):
                if str(num) in sub:
                    tmp.extend([str(i), str(sub)])
            if tmp:
                rst.extend([str(num), str(len(tmp)//2)] + tmp)
        print(str(len(rst)) + " " + " ".join(rst))
    except:
        break