39 lines
1.3 KiB
Rust
39 lines
1.3 KiB
Rust
// Copyright 2022 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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//
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// usage: ./part1 < input
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pub mod common;
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use common::Token;
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fn main() -> Result<(), &'static str> {
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let mut packets = Vec::new();
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for pair in common::packet_pairs() {
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let (left, right) = pair?;
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packets.push(left);
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packets.push(right);
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}
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let divider1 = Token::from_str("[[2]]")?;
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let divider2 = Token::from_str("[[6]]")?;
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packets.push(divider1.clone());
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packets.push(divider2.clone());
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packets.sort();
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let divider1_pos = packets.iter().position(|p| p == ÷r1).unwrap() + 1;
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let divider2_pos = packets.iter().position(|p| p == ÷r2).unwrap() + 1;
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println!("{}", divider1_pos * divider2_pos);
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Ok(())
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}
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