Created
December 9, 2022 10:15
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day1.rs
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use std::fs::File; | |
use std::io::{self, BufRead}; | |
use std::path::Path; | |
use std::str::FromStr; | |
fn main() { | |
let mut calories: Vec<u64> = Vec::new(); | |
let mut caloriesum = 0; | |
let mut maxcalories = 0; | |
// File hosts must exist in current path before this produces output | |
if let Ok(lines) = read_lines("./input") { | |
// Consumes the iterator, returns an (Optional) String | |
for line in lines { | |
if let Ok(ip) = line { | |
if let Ok(cals) = u32::from_str(&ip) { | |
//println!("found a number"); | |
caloriesum += cals; | |
} else { | |
if caloriesum > maxcalories { | |
maxcalories = caloriesum; | |
}; | |
calories.push(caloriesum as u64); | |
caloriesum = 0; | |
} | |
} | |
} | |
} | |
if caloriesum > maxcalories { | |
maxcalories = caloriesum; | |
} | |
calories.push(caloriesum as u64); | |
println!("{:?}", calories); | |
println!("Max calories {}", maxcalories); | |
let elfnumber = calories.iter().position(|&x| x == maxcalories as u64); | |
println!("elf number: {}", elfnumber.unwrap()); | |
//End of part one of the challenge. For part 2 we start with the vec of calories, need to find | |
//the top 3 | |
// | |
calories.sort(); | |
let top3:u64 = calories.iter().rev().take(3).sum(); | |
println!("top 3 {}", top3); | |
} | |
// The output is wrapped in a Result to allow matching on errors | |
// Returns an Iterator to the Reader of the lines of the file. | |
fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>> | |
where P: AsRef<Path>, { | |
let file = File::open(filename)?; | |
Ok(io::BufReader::new(file).lines()) | |
} | |
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