65 lines
2.0 KiB
Rust
65 lines
2.0 KiB
Rust
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use crate::Solution;
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use std::fs;
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#[allow(dead_code)]
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pub fn run_day_1_part_1() -> Solution {
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let location_ids = fs::read_to_string("./inputs/day1.txt").expect("Unable to read file");
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let location_lines = location_ids.split("\n");
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let mut left_locations: Vec<i32> = vec!();
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let mut right_locations: Vec<i32> = vec!();
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for location_line in location_lines {
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if location_line.len() < 1 {
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continue;
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}
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let split_line = location_line.split(" ");
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let collection: Vec<&str> = split_line.collect();
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let left_int: i32 = collection[0].parse().unwrap();
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let right_int: i32 = collection[1].parse().unwrap();
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left_locations.push(left_int);
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right_locations.push(right_int);
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}
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left_locations.sort();
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right_locations.sort();
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let llength = left_locations.len();
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let rlength = right_locations.len();
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if llength != rlength {
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panic!("Vectors has unequal length");
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}
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let mut part_1_distance = 0;
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let mut part_2_distance = 0;
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for i in 0..1000 {
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let mut diff = left_locations[i] - right_locations[i];
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diff = diff.abs();
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part_1_distance = part_1_distance + diff;
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// for part 2, we need to check how many times left location appears in right
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// then multiply the number, by the occurances count.
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let lookup = right_locations.iter().filter(|&n| *n == left_locations[i]).count();
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let value = left_locations[i] * lookup as i32;
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part_2_distance = part_2_distance + value;
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}
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let mut answers = String::new();
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let part_1 = "Part 1: ".to_string();
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answers.push_str(&part_1);
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answers.push_str(&part_1_distance.to_string());
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let newline = "\n".to_string();
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answers.push_str(&newline);
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let part_2 = "Part 2: ".to_string();
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answers.push_str(&part_2);
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answers.push_str(&part_2_distance.to_string());
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let solution = Solution {
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day: 1,
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answer: answers,
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};
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return solution;
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}
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