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26 lines
880 B
Rust
26 lines
880 B
Rust
use std::fs;
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fn main() {
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let contents = fs::read_to_string("data.txt").expect("Failed to read file");
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// break into groups divided by empty lines
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let groups: Vec<&str> = contents.trim().split("\n\n").collect();
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// turn into vectors of vectors of strings
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let groups: Vec<Vec<&str>> = groups.iter().map(|&x| x.split("\n").collect()).collect();
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// map parsing to u32
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let nums: Vec<Vec<u32>> = groups.iter().map(|x| x.iter().map(|&y| y.parse().unwrap()).collect()).collect();
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// sum each group
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let mut sums: Vec<u32> = nums.iter().map(|x| x.iter().sum()).collect();
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// find the max
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let max = sums.iter().max().unwrap();
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println!("Max Calories: {:?}", max);
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sums.sort();
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sums.reverse();
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let (top3, _) = sums.split_at(3);
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let top3_sum = top3.iter().sum::<u32>();
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println!("Top 3 Max Calories: {:?}", top3_sum);
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}
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