leetcode Single Number python

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Single Number

Given an array of integers, every element appears twice except for one. Find that single one.

 

python code:

class Solution:
# @param {integer[]} nums
# @return {integer}
def singleNumber(self, nums):
  B={}
  for i in nums:
    if i not in B:      #建立一個dict,遍曆此list,將其值作為key,並簡單的將其出現次數離散化為1和2作為value
      B[i]=1
    else:
      B[i]=2
  for i in B:
    if B[i] == 1:
      ret=i        #遍曆dict,如果某個key對應的value為1,則返回該值
      break
  return ret

leetcode Single Number python

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