本文探讨了从1到1000的英文数字中所使用的字母总数，通过分析不同数字范围内的字母数量来得出最终结果。例如，342(three hundred and forty-two)包含23个字母，而115(one hundred and fifteen)包含20个字母。文章详细介绍了计算过程，并考虑了英国英语中的and使用规范。
If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total.
If all the numbers from 1 to 1000 (one thousand) inclusive were written out in words, how many letters would be used?
求1-1000英文单词字母数之和
NOTE: Do not count spaces or hyphens. For example, 342 (three hundred and forty-two) contains 23 letters and 115 (one hundred and fifteen) contains 20 letters. The use of "and" when writing out numbers is in compliance with British usage.
分析：先求1..99单词总个数。
然后求：sum(len(one)+len(two)+..+len(nine))*100+len(hunderd)*900+len(and)*99*9+sum(1..99)*10+len（one thousand）
If all the numbers from 1 to 1000 (one thousand) inclusive were written out in words, how many letters would be used?
求1-1000英文单词字母数之和
NOTE: Do not count spaces or hyphens. For example, 342 (three hundred and forty-two) contains 23 letters and 115 (one hundred and fifteen) contains 20 letters. The use of "and" when writing out numbers is in compliance with British usage.
分析：先求1..99单词总个数。
然后求：sum(len(one)+len(two)+..+len(nine))*100+len(hunderd)*900+len(and)*99*9+sum(1..99)*10+len（one thousand）
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