class Solution(object):
def numberToWords(self, num):
"""
:type num: int
:rtype: str
"""
def helper(num):
lookup = {0: "Zero", 1:"One", 2: "Two", 3: "Three", 4: "Four", \
5: "Five", 6: "Six", 7: "Seven", 8: "Eight", 9: "Nine", \
10: "Ten", 11: "Eleven", 12: "Twelve", 13: "Thirteen", 14: "Fourteen", \
15: "Fifteen", 16: "Sixteen", 17: "Seventeen", 18: "Eighteen", 19: "Nineteen", \
20: "Twenty", 30: "Thirty", 40: "Forty", 50: "Fifty", 60: "Sixty", \
70: "Seventy", 80: "Eighty", 90: "Ninety"}
res=""
if num/100!=0 and num%100==0:
res=lookup[num/100]+" "+"Hundred"
return res
elif num/100!=0 and num%100!=0:
res=lookup[num/100]+" "+"Hundred"+" "
num%=100
if num/10==0:
res+=lookup[num%10]
elif num<21:
res+=lookup[num]
elif num%10!=0:
res+=lookup[num-num%10]+" "+lookup[num%10]
else:
res+=lookup[num-num%10]
return res
unit=["","Thousand","Million","Billion"]
count=0
res=[]
temp=[]
if num==0:
return "Zero"
while num>0:
temp.append(num%1000)
num/=1000
for i in range(len(temp)):
if temp[i]==0:
continue
if i==0:
res.append(helper(temp[i]))
else:
res.append(helper(temp[i])+" "+unit[i])
return ' '.join(res[::-1])
273. Integer to English Words
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