Day 6

src/day6.rs

@@ -0,0 +1,43 @@
+use aoc_runner_derive::{aoc, aoc_generator};
+use std::collections::HashSet;
+#[aoc_generator(day6)]
+pub fn input_generator(input: &str) -> Vec<Vec<HashSet<char>>> {
+    input
+        .split("\n\n")
+        .map(|block| {
+            block
+                .split("\n")
+                .map(|line| line.chars().collect())
+                .collect()
+        })
+        .collect()
+}
+
+#[aoc(day6, part1)]
+fn solve_part1(data: &Vec<Vec<HashSet<char>>>) -> usize {
+    let mut total = 0;
+    for group in data {
+        let mut answers: HashSet<char> = HashSet::new();
+        for person in group {
+            answers.extend(person);
+        }
+        total += answers.len();
+    }
+    return total;
+}
+
+#[aoc(day6, part2)]
+fn solve_part2(data: &Vec<Vec<HashSet<char>>>) -> usize {
+    let mut total = 0;
+    for group in data {
+        let mut answers: HashSet<char> = HashSet::new();
+        for person in group {
+            answers.extend(person);
+        }
+        for person in group {
+            answers = answers.intersection(&person).map(|v| *v).collect();
+        }
+        total += answers.len();
+    }
+    return total;
+}

src/lib.rs

@@ -4,4 +4,5 @@ pub mod day2;
 pub mod day3;
 pub mod day4;
 pub mod day5;
+pub mod day6;
 aoc_lib! { year = 2020 }