35 lines
1.1 KiB
Rust
35 lines
1.1 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::{Game, Monkey};
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fn main() -> Result<(), &'static str> {
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let game = Game::from_stdin(3)?;
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let last_round = game.take(20).last().unwrap();
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let mut item_counts: Vec<_> = last_round?
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.monkeys()
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.iter()
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.map(Monkey::item_count)
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.collect();
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item_counts.sort();
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item_counts.reverse();
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println!("{}", item_counts[0] * item_counts[1]);
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Ok(())
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}
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