世界で戦うプログラミング力を鍛える150問 の解答

1-1.rb

# encoding: utf-8
counter = Hash.new(0)
$stdin.read.split("").each do |w|
  counter[w] += 1
end

if counter.values.max <= 1
  puts "No duplication"
elsif 
  puts "duplication"
end

1-3.rb

# encoding: utf-8
def word_count line
  counter = Hash.new(0)
  line.chomp.split("").each do |w|
    counter[w] += 1
  end
  counter
end

word_count_list = []
$stdin.read.lines do |line|
  word_count_list << word_count(line)
end
question =  "片方がもう片方の並び替えになっているか:"
if word_count_list.uniq.size == 1
  puts question + "Yes"
elsif 
  puts question + "No"
end

1-4.rb

puts $stdin.read.gsub(/\s/, "%20")

1-5.rb

ary = []
result = ""
inputs = $stdin.read
inputs.split("").each do |w|
  if ary.empty?
    ary.push(w) 
  elsif ary.first == w
    ary.push(w)
  else
    result += "#{ary.first}#{ary.size.to_s}"
    ary.clear
    ary.push(w)
  end
end
if result.gsub(/1/, "") == inputs.chomp
  puts inputs
else
  puts result
end

1-8.rb

strs = $stdin.read.split("\n")
if (strs[0]*2).sub(strs[1], "") == strs[0]
  puts "s1はs2を回転させた文字列です"
else 
  puts "s1はs2を回転させた文字列ではありません"
end