From 0f73aa6d6f1b4d2774dad4a59d2776fd6f29d002 Mon Sep 17 00:00:00 2001
From: Dan Ballard <dan@mindstab.net>
Date: Mon, 7 Dec 2020 00:12:08 -0800
Subject: [PATCH] day 6

---
 inputs/06-01.txt | 2132 ++++++++++++++++++++++++++++++++++++++++++++++
 src/aoc06/mod.rs |   50 ++
 src/lib.rs       |    3 +-
 src/main.rs      |    1 +
 4 files changed, 2185 insertions(+), 1 deletion(-)
 create mode 100644 inputs/06-01.txt
 create mode 100644 src/aoc06/mod.rs

diff --git a/inputs/06-01.txt b/inputs/06-01.txt
new file mode 100644
index 0000000..f5f7603
--- /dev/null
+++ b/inputs/06-01.txt
@@ -0,0 +1,2132 @@
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diff --git a/src/aoc06/mod.rs b/src/aoc06/mod.rs
new file mode 100644
index 0000000..ba38a25
--- /dev/null
+++ b/src/aoc06/mod.rs
@@ -0,0 +1,50 @@
+use std::error::Error;
+use std::fs;
+use std::collections::HashMap;
+use std::str;
+
+
+pub fn both(filename: &str) -> Result<(), Box<dyn Error>> {
+    let contents = fs::read_to_string(filename)?;
+
+    let mut answers: HashMap<u8, bool> = HashMap::new();
+    let mut sum = 0;
+    for line in contents.lines() {
+        if line.trim() == "" {
+            sum += answers.len();
+            answers = HashMap::new();
+            continue
+        }
+
+        for byte in line.as_bytes() {
+            answers.insert(*byte, true);
+        }
+    }
+    sum += answers.len();
+    println!("sum of group unique questions with yes: {}", sum);
+    answers = HashMap::new();
+
+    let mut first = true;
+    sum = 0;
+    for line in contents.lines() {
+        if line.trim() == "" {
+            sum += answers.len();
+            answers = HashMap::new();
+            first = true;
+            continue
+        }
+        if first {
+            for byte in line.as_bytes() {
+                answers.insert(*byte, true);
+            }
+            first = false;
+        } else {
+            answers.retain(|k, _| line.as_bytes().contains(k));
+        }
+    }
+    sum += answers.len();
+    println!("sum of group questions with all yes: {}", sum);
+
+    Ok(())
+}
+
diff --git a/src/lib.rs b/src/lib.rs
index 6b54a7e..90b379b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,4 +2,5 @@ pub mod aoc01;
 pub mod aoc02;
 pub mod aoc03;
 pub mod aoc04;
-pub mod aoc05;
\ No newline at end of file
+pub mod aoc05;
+pub mod aoc06;
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 0400de0..f3daceb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,6 +12,7 @@ fn main() {
         3 => advent_of_code::aoc03::both("./inputs/03-01.txt"),
         4 => advent_of_code::aoc04::both("./inputs/04-01.txt"),
         5 => advent_of_code::aoc05::both("./inputs/05-01.txt"),
+        6 => advent_of_code::aoc06::both("./inputs/06-01.txt"),
         _ => Err(format!("unsupported day {}", day).into()),
     };