Created
December 23, 2015 05:27
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Day 23 Solution
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| #!/usr/bin/python | |
| # | |
| # Copyright (c) 2015 Benjamin Geiger <github@bgeiger.net> | |
| """ | |
| Module-specific doc string. | |
| """ | |
| from __future__ import absolute_import | |
| from __future__ import division | |
| from __future__ import unicode_literals | |
| from __future__ import print_function | |
| import sys | |
| if sys.version_info < (3, 0): | |
| input = raw_input | |
| #regs = {'a': 0, 'b': 0} # Original conditions. | |
| regs = {'a': 1, 'b': 0} # Part 2. | |
| pc = 0 | |
| def main(): | |
| global pc, regs | |
| with open("input.txt", "r") as f: | |
| lines = f.readlines() | |
| # I was going to parse the lines into memory and then run it there, | |
| # but it was easier just to parse each line as I needed it. | |
| while pc < len(lines): | |
| line = lines[pc] | |
| print("PC:", pc, line) | |
| print(regs) | |
| tokens = line.split() | |
| if tokens[0].lower() == 'hlf': | |
| reg = tokens[1].lower() | |
| regs[reg] //= 2 | |
| pc += 1 | |
| elif tokens[0].lower() == 'tpl': | |
| reg = tokens[1].lower() | |
| regs[reg] *= 3 | |
| pc += 1 | |
| elif tokens[0].lower() == 'inc': | |
| reg = tokens[1].lower() | |
| regs[reg] += 1 | |
| pc += 1 | |
| elif tokens[0].lower() == 'jmp': | |
| dst = int(tokens[1]) | |
| pc += dst | |
| elif tokens[0].lower() == 'jie': | |
| reg = tokens[1][:-1] | |
| dst = int(tokens[2]) | |
| if regs[reg] % 2 == 0: | |
| pc += dst | |
| else: | |
| pc += 1 | |
| elif tokens[0].lower() == 'jio': | |
| reg = tokens[1][:-1] | |
| dst = int(tokens[2]) | |
| if regs[reg] == 1: | |
| pc += dst | |
| else: | |
| pc += 1 | |
| else: | |
| print("Unknown instruction:", line) | |
| break | |
| print() | |
| print("ANSWER:", regs['b']) | |
| if __name__ == "__main__": | |
| main() | |
| # vim: set et sw=4 ts=4: |
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