第一题python实现SQL输出重名的人的个数： while True: try: matrix = [] n = list(map(int, input().strip().split()))[0] for i in range(n): id, name = list(map(str, input().strip().split())) matrix.append([id, name]) dic = {} for i in range(n): if matrix[i][1] in dic: dic[matrix[i][1]] += 1 dic[matrix[i][1]] = 1 count = 0 for k, v in dic.items(): if v >= 2: count += 1 print(count) except EOFError: break