名字重复也能用字典： while True: try: num = int(input()) n = int(input()) dic = {} for i in range(num): person = input().split() if int(person[1]) in dic: dic[int(person[1])].append(person[0]) else: dic[int(person[1])] = [person[0]] if n == 0: for i in sorted(dic,reverse=True): for j in dic[i]: print(j + ' ' + str(i)) else: for i in sorted(dic): for j in dic[i]: print(j + ' ' + str(i)) except: break