古いチャットログを解析

chatlog.rb

input_lines = $stdin.read.split("\n")

linecount = input_lines[0].to_i

chatlines = input_lines[1..-1]

chatarr = chatlines.map do |item|
    item.split(" ")
end

grouparr = chatarr.group_by do |item|
    item[0]
end

resultarr = []
grouparr.each do |item|
    chatid = item[0]
    
    chatstr = item[1].inject("") do |memo, str|
        memo + str[1]
    end
    
    resultstr = "#{chatid.to_s} #{chatstr}"
    
    resultarr << [chatid.to_i, resultstr]
end

resultarr.sort! do |a,b|
    a[0] <=> b[0]
end

resultarr.each do |item|
    puts item[1]
end