Yelp 10/07 on-campus

就一轮 是个亚裔姐姐. 先问了简历，然后问了网站访问比较慢 是哪些原因.
然后codin

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这道题挺难的啊。是lc hard number to english

1. class Solution(object):
   
2.     def __init__(self):
   
3.         self.less20 = ["","One","Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten","Eleven","Twelve","Thirteen","Fourteen","Fifteen","Sixteen","Seventeen","Eighteen","Nineteen"]
   
4.         self.tens = ["","Ten","Twenty","Thirty","Forty","Fifty","Sixty","Seventy","Eighty","Ninety"]
   
5.         self.thousands = ["","Thousand","Million","Billion"]
   
6. 
   
7.     def numberToWords(self, num):
   
8.         """
   
9.         :type num: int
   
10.         :rtype: str
    
11.         """
    
12.         res = ''
    
13.         index = 0
    
14.         while num:
    
15.             res = self.helper(num%1000) + ' ' + self.thousands[index] + ' ' + res
    
16.             index += 1
    
17.             num = num//1000
    
18. 
    
19.         return res
    
20. 
    
21.     def helper(self, num):
    
22. 
    
23.         res = ''
    
24.         if num>=100:
    
25.             res = self.less20[num//100] + ' ' + 'Hundred'
    
26.             num = num%100
    
27.         if num >=20:
    
28.             res = res + (' ' if res else '') + self.tens[num//10] + (' ' if self.tens[num//10] else '') + self.less20[num%10]
    
29.         else:
    
30.             res = res + (' ' if res else '') + self.less20[num]
    
31.         return res
    
32. 
    
33. num = 2111111121
    
34. so = Solution()
    
35. a = so.numberToWords(num)
    
36. print(a)

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