53 lines
1.4 KiB
Nim
53 lines
1.4 KiB
Nim
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# Copyright 2021 Christian Ulrich
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# usage: ./part2 < input
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import strutils
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proc position(): int =
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var
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line = ""
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aim = 0
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hpos = 0
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vpos = 0
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while readLine(stdin, line):
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if line.len() > 0:
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let command = line.split(' ', 1)
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if command.len() != 2:
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raise newException(ValueError, "invalid command")
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let arg = parseInt(command[1])
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case command[0]
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of "forward":
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hpos.inc(arg)
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vpos.inc(aim * arg)
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of "up":
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aim.dec(arg)
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of "down":
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aim.inc(arg)
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else:
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raise newException(ValueError, "invalid command")
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result = hpos * vpos
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proc main(): int =
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try:
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echo position()
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except Exception as error:
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echo error.msg
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result = -1
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when isMainModule:
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quit(main())
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