day 2 solution
parent
21d0ccd59a
commit
59c1563ace
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[[package]]
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name = "day2"
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version = "0.1.0"
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dependencies = [
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"edit-distance 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "edit-distance"
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version = "2.0.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[metadata]
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"checksum edit-distance 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3bd26878c3d921f89797a4e1a1711919f999a9f6946bb6f5a4ffda126d297b7e"
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[package]
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name = "day2"
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version = "0.1.0"
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authors = ["Andrew Coleman <penguincoder@gmail.com>"]
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[dependencies]
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edit-distance = "2.0.0"
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extern crate edit_distance;
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use std::collections::HashMap;
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use std::fs::File;
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use std::io::{BufRead, BufReader};
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use edit_distance::edit_distance;
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fn get_char_counts(input: &String) -> (bool, bool) {
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let mut has_two = false;
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let mut has_three = false;
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let mut map = HashMap::new();
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for char in input.chars() {
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map.entry(char).and_modify(|x| *x += 1).or_insert(1);
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}
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for (_char, count) in map {
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if has_two && has_three {
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break;
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}
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if count == 2 {
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has_two = true;
|
||||||
|
} else if count == 3 {
|
||||||
|
has_three = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
(has_two, has_three)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn calc_checksum(lines: &Vec<String>) {
|
||||||
|
let mut two_count = 0;
|
||||||
|
let mut three_count = 0;
|
||||||
|
for line in lines.iter() {
|
||||||
|
let (has_two, has_three) = get_char_counts(line);
|
||||||
|
if has_two {
|
||||||
|
two_count += 1;
|
||||||
|
}
|
||||||
|
if has_three {
|
||||||
|
three_count += 1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
println!("checksum: {}", two_count * three_count);
|
||||||
|
}
|
||||||
|
|
||||||
|
fn find_single_char_difference(lines: &mut Vec<String>) {
|
||||||
|
let line = lines.pop().expect("ran out of lines to find the single char difference!");
|
||||||
|
let mut found = false;
|
||||||
|
for other in lines.iter() {
|
||||||
|
if edit_distance(&line, other) == 1 {
|
||||||
|
found = true;
|
||||||
|
println!("{} and {}", line, other);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if !found {
|
||||||
|
find_single_char_difference(lines);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn main() {
|
||||||
|
let mut lines: Vec<String> = BufReader::new(File::open("input").unwrap())
|
||||||
|
.lines()
|
||||||
|
.map(|line| line.unwrap())
|
||||||
|
.collect();
|
||||||
|
calc_checksum(&lines);
|
||||||
|
find_single_char_difference(&mut lines);
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue