day 6

4 files changed, 2286 insertions, 0 deletions

diff --git a/data/6.txt b/data/6.txt
new file mode 100644
index 0000000..cb5c69a
--- /dev/null
+++ b/data/6.txt
@@ -0,0 +1,2237 @@
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diff --git a/src/2020/6/mod.rs b/src/2020/6/mod.rs
new file mode 100644
index 0000000..94dd4da
--- /dev/null
+++ b/src/2020/6/mod.rs
@@ -0,0 +1,43 @@
+pub fn part1() -> anyhow::Result<i64> {
+    let input = crate::util::read_file_str("data/6.txt")?;
+    let mut yes = std::collections::HashSet::new();
+    let mut total = 0;
+    for line in input.lines() {
+        if line == "" {
+            total += yes.len() as i64;
+            yes = std::collections::HashSet::new();
+        } else {
+            for c in line.chars() {
+                yes.insert(c);
+            }
+        }
+    }
+    total += yes.len() as i64;
+    Ok(total)
+}
+
+pub fn part2() -> anyhow::Result<i64> {
+    let input = crate::util::read_file_str("data/6.txt")?;
+    let mut yes = std::collections::HashSet::new();
+    for c in 'a'..='z' {
+        yes.insert(c);
+    }
+    let mut total = 0;
+    for line in input.lines() {
+        if line == "" {
+            total += yes.len() as i64;
+            yes = std::collections::HashSet::new();
+            for c in 'a'..='z' {
+                yes.insert(c);
+            }
+        } else {
+            for c in 'a'..='z' {
+                if !line.contains(c) {
+                    yes.remove(&c);
+                }
+            }
+        }
+    }
+    total += yes.len() as i64;
+    Ok(total)
+}
diff --git a/src/2020/mod.rs b/src/2020/mod.rs
index 8919f5f..47f5150 100644
--- a/src/2020/mod.rs
+++ b/src/2020/mod.rs
@@ -8,6 +8,8 @@ mod day3;
 mod day4;
 #[path = "5/mod.rs"]
 mod day5;
+#[path = "6/mod.rs"]
+mod day6;
 
 pub fn run(day: u8, puzzle: u8) -> anyhow::Result<i64> {
     match (day, puzzle) {
@@ -21,6 +23,8 @@ pub fn run(day: u8, puzzle: u8) -> anyhow::Result<i64> {
         (4, 2) => day4::part2(),
         (5, 1) => day5::part1(),
         (5, 2) => day5::part2(),
+        (6, 1) => day6::part1(),
+        (6, 2) => day6::part2(),
         _ => Err(anyhow::anyhow!("unknown puzzle {}-{}", day, puzzle)),
     }
 }
diff --git a/src/main.rs b/src/main.rs
index af137fd..3905d9b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::collapsible_if)]
+
 mod util;
 #[path = "2020/mod.rs"]
 mod year2020;