40 lines
1.1 KiB
Rust
40 lines
1.1 KiB
Rust
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use std::fs::File;
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use std::io::BufRead;
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use std::io::BufReader;
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use std::io::Lines;
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use std::io::Read;
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use std::io::Result;
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fn get_calorie_totals<R: Read + BufRead>(lines: Lines<R>) -> Vec<u32> {
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let mut elves: Vec<u32> = Vec::new();
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let mut current_calorie_count: u32 = 0;
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for line in lines {
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let unwrapped_line = line.unwrap();
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if unwrapped_line.is_empty() {
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elves.push(current_calorie_count);
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println!("Elf {}: {} calories", elves.len(), current_calorie_count);
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current_calorie_count = 0;
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continue;
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}
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let u32_value = u32::from_str_radix(&unwrapped_line, 10)
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.expect(format!("Couldn't read u32 value from string: {}", unwrapped_line).as_str());
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current_calorie_count += u32_value;
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}
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elves.sort_unstable_by(|a, b| b.cmp(a));
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elves
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}
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pub fn main(input_filename: &String) -> Result<()> {
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let file = File::open(input_filename)?;
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let reader = BufReader::new(file);
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let elves = get_calorie_totals(reader.lines());
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println!("Elf with highest calorie count in knapsack: {}", elves[0]);
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Ok(())
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}
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