43 lines
839 B
Rust
43 lines
839 B
Rust
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use super::Result;
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const INPUT: &str = include_str!("../input/day01.txt");
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pub fn run() -> Result<()> {
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println!("part 1: {}", part1(INPUT)?);
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Ok(())
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}
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fn fuel_needed(module_weight: u64) -> u64 {
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(module_weight / 3) - 2
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}
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fn part1(input: &str) -> Result<u64> {
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input
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.lines()
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.map(|line| line.parse::<u64>())
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.map(|w| match w {
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Ok(w) => Ok(fuel_needed(w)),
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Err(e) => Err(Box::from(e)),
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})
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.sum()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn part1_provided() {
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assert_eq!(fuel_needed(12), 2);
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assert_eq!(fuel_needed(14), 2);
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assert_eq!(fuel_needed(1969), 654);
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assert_eq!(fuel_needed(100756), 33583);
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}
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#[test]
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fn part1_real() {
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assert_eq!(part1(INPUT).unwrap(), 3268951);
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}
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}
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