我需要编写一个执行以下操作的方法
consecutive_count("aaabbcbbaaa") == [["a", 3], ["b", 2], ["c", 1], ["b", 2], ["a", 3]]
我收到了代码,但看起来很难看,我正在努力寻找更好的解决方案,请提供建议。
这是我的代码:
def consecutive_count(str)
el = str[0]; count = 0; result = []
str.split("").each do |l|
if (el != l)
result << [el, count]
count = 1
el = l
else
count +=1
end
end
result << [el, count] if !el.nil?
return result
end
答案 0 :(得分:3)
"aaabbcbbaaa".scan(/(?<s>(?<c>.)\k<c>*)/).map{|s, c| [c, s.length]}
# => [["a", 3], ["b", 2], ["c", 1], ["b", 2], ["a", 3]]
或
"aaabbcbbaaa".scan(/((.)\2*)/).map{|s, c| [c, s.length]}
# => [["a", 3], ["b", 2], ["c", 1], ["b", 2], ["a", 3]]
答案 1 :(得分:3)
这是一种方式:
s = "aaabbcbbaaa"
s.chars.chunk{|e| e }.map{|item,ary| [item,ary.size]}
# => [["a", 3], ["b", 2], ["c", 1], ["b", 2], ["a", 3]]
答案 2 :(得分:0)
Regexp解决方案:
my_s = "aaabbcbbaaa"
p my_s.scan(/(.)(\1*)/).map{|x,y| [x, y.size + 1]}
#=> [["a", 3], ["b", 2], ["c", 1], ["b", 2], ["a", 3]]
或
a, result = "aaabbcbbaaa", []
result << a.slice!(/(\w)\1*/) until a.empty?
然后将结果映射到计数。
答案 3 :(得分:0)
一个不涉及正则表达式魔法的解决方案(虽然它们有点短,可能更快)是这样的:
str.each_char.each_with_object([]) do |char, result|
if (result.last || [])[0] == char
result.last[1] += 1
else
result << [char, 1]
end
end
根据您的理解程度,它可能更好地传达您的预期意义,这可能有助于在6个月内调试该事物:)
答案 4 :(得分:-1)
您可以尝试:
def consecutive_count(str)
result = {}
array = str.split(//).uniq
array.each.map {|char| result[char] = 0}
array.each do |char|
while str.starts_with?(char) do
result[char] += 1
str[0] = ""
end
result
end