28 lines
755 B
Rust
28 lines
755 B
Rust
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use crate::Solution;
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use std::fs;
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use std::process;
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use regex::Regex;
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pub fn run_day_3() -> Solution {
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let file = fs::read_to_string("./inputs/day3.txt").expect("Unable to parse file");
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let re = Regex::new("mul\\((\\d{1,3}),(\\d{1,3})\\)").unwrap();
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let mut part1_sum = 0;
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for mul in re.captures_iter(&file) {
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// Multiply the second and the third matches.
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let num1: &u32 = &mul[1].parse().expect("Conversion failed");
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let num2: &u32 = &mul[2].parse().expect("Conversion failed");
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let total = num1 * num2;
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part1_sum += total;
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}
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let solution = Solution {
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day: 3,
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answer_1: part1_sum.to_string(),
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answer_2: "Not sure".to_string(),
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};
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solution
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}
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