leetcode 179. Largest Number

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class Solution:    # @param {integer[]} nums    # @return {string}    def largestNumber(self, nums):        """        https://discuss.leetcode.com/topic/7235/my-3-lines-code-in-java-and-python        """        num = [str(a) for a in nums]        num.sort(cmp = lambda x,y: cmp(y+x,x+y))        return "".join(num).lstrip('0') or '0'

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