register-accumulator.rb

#!/usr/bin/ruby

#
# Reads lines from STDIN such as
#
# 00000001 01234578
#
# and assumes that the first column is a register offset and the 2nd is a value.
#
# Will then output the all registers ever accessed with the value they were set to last.
#

regs = {}

STDIN.read.split("\n").each do |line|
  a = line.split(' ')
  regs[a[0]] = a[1]
end

regs.sort.to_h.each do |reg, val|
  print "#{reg}: #{val}\n"
end