Ruby数组转换

时间:2015-07-22 00:42:02

标签: arrays ruby string

我有一串数字:

s = "12345678910"

正如您所看到的那样,数字1到10按递增顺序列出。我想将它转换为这些数字的数组:

a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

我该怎么办?

3 个答案:

答案 0 :(得分:5)

这个怎么样:

a = ["123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899"]
b = a.first.each_char.map {|n| n.to_i }
if b.size > 8
  c = b[0..8]
  c += b[9..b.size].each_slice(2).map(&:join).map(&:to_i)
end

# It would yield as follows:
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99]

对于99以后的后期数字,请相应地修改现有谓词。

答案 1 :(得分:1)

假设有一个单调的序列,我就跑了。

input = a.first.chars
output = []
previous_int = 0

until input.empty?
  temp = []
  temp << input.shift until temp.join.to_i > previous_int
  previous_int = temp.join.to_i
  output << previous_int
end

puts output.to_s

#=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

答案 2 :(得分:0)

<强>假设

  • 从字符串中提取的第一个(自然)数字是转换为整数的字符串的第一个字符;
  • 如果从字符串中提取数字n,则提取的下一个数字m满足n <= m(即,序列是单调非递减的);
  • 如果从字符串中提取n,则提取的下一个数字将具有尽可能少的数字(即,最多一个数字大于n中的数字位数);和
  • 无需检查字符串的有效性(例如,&#34; 54632&#34;无效)。

<强>代码

def split_it(str)
  return [] if str.empty?
  a = [str[0]]
  offset = 1
  while offset < str.size
    sz = a.last.size
    sz +=1 if str[offset,sz] < a.last
    a << str[offset, sz]
    offset += sz
  end
  a.map(&:to_i)
end

<强>实施例

split_it("12345678910")
  #=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

split_it("12343636412252891407189118901")
  #=> [1, 2, 3, 4, 36, 36, 41, 225, 289, 1407, 1891, 18901]