nim game & single number

</pre><p></p><p>nim game:</p><pre code_snippet_id="1555146" snippet_file_name="blog_20160113_1_6996155" name="code" class="python">class Solution(object):    def canWinNim(self, n):        if(n%4==0):            return False        else:            return True

single number:

class Solution(object):    def singleNumber(self, nums):        res=nums[0]        for i in range (1,len(nums)):            res=nums[i]^res        return res

add Digits

class Solution(object):    def addDigits(self, num):        if (num==0):            return 0        elif(num%9==0):            return 9        else:            return num%9