[LeetCode][Python]Largest Number

clh899

# -*- coding: utf8 -*-
'''
__author__ = 'dabay.wang@gmail.com'
https://oj.leetcode.com/problems/largest-number/
Given a list of non negative integers, arrange them such that they form the largest number.
For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.
Note: The result may be very large, so you need to return a string instead of an integer.
===Comments by Dabay===
把所有num都存到一个hash表中，用值来记录出现的次数。
对于，num中很多重复项来说，这样的处理可以节约时间。
定义比较的方法：当两个字符串长度不一样时，把他们互相加到末尾比较。
'''
class Solution:
    # @param num, a list of integers
    # @return a string
    def largestNumber(self, num):
        def compare(num1, num2):
            if len(num1) != len(num2):
                num1,num2 = num1 + num2,num2 + num1
            return [-1, 1][num1 > num2]
        d = {}
        for n in num:
            n = str(n)
            if n not in d:
                d[n] = 1
            else:
                d[n] = d[n] + 1
        keys = d.keys()
        keys = sorted(keys, cmp=compare, reverse=True)
        result = ""
        for k in keys:
            result = result + str(k) * d[k]
        result = result.lstrip('0')
        if len(result) == 0:
            return "0"
        else:
            return result

def main():
    s = Solution()
    nums = [3, 30, 34, 5, 9]
    nums = 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    #nums = [0, 0]
    print s.largestNumber(nums)

if __name__ == "__main__":
    import time
    start = time.clock()
    main()
    print "%s sec" % (time.clock() - start)