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authorNat Lasseter <Nat Lasseter nathan@bytemark.co.uk>2017-12-23 12:53:06 +0000
committerNat Lasseter <Nat Lasseter nathan@bytemark.co.uk>2017-12-23 12:53:06 +0000
commit0dd497895a93bec09c911154ffefab85a9559375 (patch)
tree6d6b96d94fb753b8c883371457567eaa55189b51 /day23/part2rb
parent4f32293785d818f5c31394ef0f85cb729797e053 (diff)
C attempt. Probably slightly faster. No free optimisations.day23
Diffstat (limited to 'day23/part2rb')
-rwxr-xr-xday23/part2rb34
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+#!/usr/bin/env ruby
+
+def valof(reg_file, reg_or_int)
+ if reg_or_int >= 'a' && reg_or_int <= 'z' then
+ return reg_file[reg_or_int] || 0
+ end
+ return reg_or_int.to_i
+end
+
+input = $stdin.readlines.map(&:chomp)
+
+reg = {'a' => 1}
+pc = 0
+
+loop do
+ break if pc < 0 || pc >= input.length
+ istr = input[pc].split
+ case istr[0]
+ when 'set'
+ reg[istr[1]] = valof(reg, istr[2])
+ when 'sub'
+ reg[istr[1]] = valof(reg, istr[1]) - valof(reg, istr[2])
+ when 'mul'
+ reg[istr[1]] = valof(reg, istr[1]) * valof(reg, istr[2])
+ when 'jnz'
+ if valof(reg, istr[1]) != 0 then
+ pc += valof(reg, istr[2])
+ pc -= 1
+ end
+ end
+ pc += 1
+end
+
+puts reg['h']