class Solution:
def numberToWords(self, num: int) -> str:
to19='One Two Three Four Five Six Seven Eight Nine Ten Eleven Twelve ' \
'Thirteen Fourteen Fifteen Sixteen Seventeen Eighteen Nineteen'.split()
tens='Twenty Thirty Forty Fifty Sixty Seventy Eighty Ninety'.split()
def words(n):
if n<20:
return to19[n-1:n]
if n<100:
return [tens[n//10-2]]+words(n%10)
if n<1000:
return [to19[n//100-1]]+['Hundred']+words(n%100)
for p,w in enumerate(('Thousand','Million','Billion'),1):
# print(p,w)
if n<1000**(p+1):
return words(n//(1000**p))+[w]+words(n%(1000**p))
return ' '.join(words(num)) or 'Zero'模拟题
for p,w in enumerate(('Thousand','Million','Billion'),1):
p从1开始
