ONLY DO WHAT ONLY YOU CAN DO

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Project Euler Problem 17

Project Euler

1から1000まですべて単語で書くのに必要な文字はいくつか?

1 から 5 までの数字を英単語で書けば one, two, three, four, five であり, 全部で の文字が使われている.

では 1 から 1000 (one thousand) までの数字をすべて英単語で書けば, 全部で何文字になるか.

注: 空白文字やハイフンを数えないこと. 例えば, 342 (three hundred and forty-two) は 23 文字, 115 (one hundred and fifteen) は 20 文字と数える. なお, "and" を使用するのは英国の慣習.

Number letter counts

If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 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?

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.