ruby 从标准快速读取 [英] ruby fast reading from std

问题描述

从 STDIN 读取 1000000 个字符(整数)并将其拆分为一个字符整数(不是字符串)数组的最快方法是什么?

What is the fastest way to read from STDIN a number of 1000000 characters (integers), and split it into an array of one character integers (not strings) ?

123456 > [1,2,3,4,5,6]

推荐答案

这应该相当快:

a = []
STDIN.each_char do |c|
  a << c.to_i
end

尽管一些粗略的基准测试表明这个 hackish 版本要快得多:

although some rough benchmarking shows this hackish version is considerably faster:

a = STDIN.bytes.map { |c| c-48 }

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