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273. 整数转换英文表示.py
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273. 整数转换英文表示.py
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"""
题目描述：
将非负整数转换为其对应的英文表示。可以保证给定输入小于 231 - 1 。
示例 1:
输入: 123
输出: "One Hundred Twenty Three"
示例 2:
输入: 12345
输出: "Twelve Thousand Three Hundred Forty Five"
示例 3:
输入: 1234567
输出: "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"
示例 4:
输入: 1234567891
输出: "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One"
题目分析：
递归，分区间讨论，利用递归更方便
"""
class Solution:
def numberToWords(self, num: int) -> str:
if ( num==0 ):
return "Zero"
gewei = {
1 : 'One',
2 : 'Two',
3 : 'Three',
4 : 'Four',
5 : 'Five',
6 : 'Six',
7 : 'Seven',
8 : 'Eight',
9 : 'Nine',
}
shiwei = {
2: 'Twenty',
3: 'Thirty',
4: 'Forty',
5: 'Fifty',
6: 'Sixty',
7: 'Seventy',
8: 'Eighty',
9: 'Ninety',
}
shiji = {
10: 'Ten',
11: 'Eleven',
12: 'Twelve',
13: 'Thirteen',
14: 'Fourteen',
15: 'Fifteen',
16: 'Sixteen',
17: 'Seventeen',
18: 'Eighteen',
19: 'Nineteen'
}
other = {
100:'Hundred',
1000:'Thousand',
1000000:'Million',
1000000000:'Billion'
}
res_list = []
# 大于十亿
if ( num>=1000000000 ):
res1 = gewei[num//1000000000] + " Billion"
res_list.append(res1)
num = num % 1000000000
# 大于百万
if ( num>=1000000 ):
res2 = self.numberToWords(num//1000000) + " Million"
res_list.append(res2)
num = num % 1000000
# 大于千
if ( num>=1000 ):
res3 = self.numberToWords(num//1000) + " Thousand"
res_list.append(res3)
num = num % 1000
# 大于百
if ( num>=100 ):
res4 = self.numberToWords(num//100) + " Hundred"
res_list.append(res4)
num = num %100
# 大于20
if ( num>=20 ):
res5 = shiwei[num//10]
res_list.append(res5)
num = num % 10
# 大于10
if ( num>=10 ):
res6 = shiji[num]
res_list.append(res6)
elif (num>0):
# 小于10
res6 = gewei[num]
res_list.append(res6)
res = ""
for e in res_list:
if ( e is not "" ):
res = res + " "+e
return res.strip()