题解 | #数组中重复的数字#
数组中重复的数字
http://www.nowcoder.com/practice/6fe361ede7e54db1b84adc81d09d8524
step1: 借助collections的模块进行处理 step2: 遍历collections.Counter的结果
import collections
class Solution:
def duplicate(self , numbers ):
if not numbers:
return -1
# write code here
result_dict = collections.Counter(numbers)
# traverse the dict
for key,val in result_dict.items():
if val>1:
return key
