28 lines
726 B
Rust
28 lines
726 B
Rust
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// AoC 2022 - day 1.
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fn sum_elf(elf: &str) -> usize {
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elf.lines()
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.map(|s| s.parse::<usize>().expect("invalid input"))
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.sum()
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}
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fn group_by_elf(input: &str) -> Vec<usize> {
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input.rsplit("\n\n").map(sum_elf).collect()
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}
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fn top_elf(input: &str) -> usize {
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group_by_elf(&input).into_iter().max().unwrap()
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}
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fn top_n_elves(n: usize, input: &str) -> usize {
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let mut by_elf = group_by_elf(input);
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by_elf.sort_by(|a, b| b.cmp(a)); // high->low
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(by_elf[..n]).iter().sum()
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}
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fn main() {
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let input = std::fs::read_to_string("input").expect("input should be in file named 'input'");
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println!("top elf: {}", top_elf(&input));
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println!("top 3 elves: {}", top_n_elves(3, &input));
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}
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