Day 2 2018

2018/input/2018/day2.txt

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2018/src/bin/day2.rs

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+use std::collections::HashMap;
+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string("input/2018/day2.txt").expect("input");
+    part1(&input);
+    part2(&input);
+}
+
+fn part1(input: &str) {
+    let mut twos = 0;
+    let mut threes = 0;
+
+    for line in input.lines() {
+        let char_counts = count_chars(line);
+        if char_counts.iter().any(|(_k, &v)| v == 2) {
+            twos += 1;
+        }
+        if char_counts.iter().any(|(_k, &v)| v == 3) {
+            threes += 1;
+        }
+    }
+
+    println!("{}", twos * threes);
+}
+
+fn count_chars(line: &str) -> HashMap<char, u32> {
+    let mut counts = HashMap::new();
+    line.chars()
+        .for_each(|chr| *counts.entry(chr).or_insert(0) += 1);
+    counts
+}
+
+fn part2(input: &str) {
+    for (i, line) in input.lines().enumerate() {
+        for (j, other) in input.lines().enumerate() {
+            if i == j {
+                continue;
+            }
+
+            let number_differing =
+                line.chars().zip(other.chars()).fold(
+                    0,
+                    |acc, (chr1, chr2)| if chr1 != chr2 { acc + 1 } else { acc },
+                );
+
+            if (number_differing == 1) {
+                println!("{} and {} differ by 1 char", line, other);
+                let common: String = line
+                    .chars()
+                    .zip(other.chars())
+                    .filter_map(|(chr1, chr2)| if chr1 != chr2 { None } else { Some(chr1) })
+                    .collect();
+                println!("Common: {}", common);
+                return;
+            }
+        }
+    }
+}