Project Euler with Ruby on WSL [Problem 17]

ruby を讃えよ

problem 16 がワンライナーで解けたぞ。

問題

Number letter counts

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?

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.

私訳

整数表現の文字数

1 から 5 を英語で書くと、one, two, three, four, five, then 全部で 19 文字になる

1 から 1000 まで (1000含む) をすべて書き下したとき、合計文字数はいくつか？

注: 空白やハイフンは数えないが、"and" は数える

解答方針

地道にやるしかない。 eleven, twelve, thirteen, ... nineteen までは特別扱いする必要がある。

fourteen を forteen ってやって合計が合わず泣いた