diff --git a/input/2020/day4.txt b/input/2020/day4.txt
new file mode 100644
index 0000000..03b412d
--- /dev/null
+++ b/input/2020/day4.txt
@@ -0,0 +1,1138 @@
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diff --git a/input/2020/day5.txt b/input/2020/day5.txt
new file mode 100644
index 0000000..1de357f
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diff --git a/input/2020/day6.txt b/input/2020/day6.txt
new file mode 100644
index 0000000..07c4388
--- /dev/null
+++ b/input/2020/day6.txt
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diff --git a/src/day1.rs b/src/day1.rs
new file mode 100644
index 0000000..f1315c5
--- /dev/null
+++ b/src/day1.rs
@@ -0,0 +1,39 @@
+use aoc_runner_derive::{aoc, aoc_generator};
+
+#[aoc_generator(day1)]
+pub fn d1_input(input: &str) -> Vec<u64> {
+    let mut entries: Vec<u64> = input.split('\n').map(|x| x.parse().unwrap()).collect();
+    entries.sort();
+    entries
+}
+
+#[aoc(day1, part1)]
+pub fn solve_d1_p1(input: &[u64]) -> u64 {
+    for entry in input {
+        let needed = 2020 - entry;
+        if let Ok(idx) = input.binary_search(&needed) {
+            return entry * input[idx];
+        }
+    }
+    panic!("not found");
+}
+
+#[aoc(day1, part2)]
+pub fn solve_d1_p2(input: &[u64]) -> Option<u64> {
+    for i in 0..input.len() - 2 {
+        let entry1 = input[i];
+        for j in i + 1..input.len() - 1 {
+            let entry2 = input[j];
+            if entry1 + entry2 > 2020 {
+                break;
+            }
+            for k in j + 1..input.len() {
+                let entry3 = input[k];
+                if entry1 + entry2 + entry3 == 2020 {
+                    return Some(entry1 * entry2 * entry3);
+                }
+            }
+        }
+    }
+    return None;
+}
diff --git a/src/day2.rs b/src/day2.rs
new file mode 100644
index 0000000..f9f87e1
--- /dev/null
+++ b/src/day2.rs
@@ -0,0 +1,53 @@
+use aoc_runner_derive::aoc;
+
+struct PasswdEntry<'a> {
+    lower_bound: usize,
+    upper_bound: usize,
+    policy_char: u8,
+    passwd: &'a [u8],
+}
+
+impl<'a> PasswdEntry<'a> {
+    fn parse(mut input: &'a str) -> Option<Self> {
+        let lb_idx = input.find('-')?;
+        let lower_bound: usize = (&input[..lb_idx]).parse().ok()?;
+        input = &input[lb_idx + 1..];
+
+        let ub_idx = input.find(' ')?;
+        let upper_bound: usize = (&input[..ub_idx]).parse().ok()?;
+        input = &input[ub_idx + 1..];
+
+        let policy_char = input.as_bytes()[0];
+        let passwd = &input[3..].as_bytes();
+        Some(PasswdEntry {
+            lower_bound,
+            upper_bound,
+            policy_char,
+            passwd,
+        })
+    }
+}
+
+#[aoc(day2, part1)]
+pub fn solve_d2_p1(input: &str) -> usize {
+    fn line_is_valid(line: &str) -> bool {
+        let entry = PasswdEntry::parse(line).unwrap();
+        let count = entry
+            .passwd
+            .iter()
+            .filter(|&&b| b == entry.policy_char)
+            .count();
+        (count >= entry.lower_bound) && (count <= entry.upper_bound)
+    }
+    input.split('\n').filter(|x| line_is_valid(x)).count()
+}
+
+#[aoc(day2, part2)]
+pub fn solve_d2_p2(input: &str) -> usize {
+    fn line_is_valid(line: &str) -> bool {
+        let entry = PasswdEntry::parse(line).unwrap();
+        (entry.passwd[entry.lower_bound - 1] == entry.policy_char)
+            ^ (entry.passwd[entry.upper_bound - 1] == entry.policy_char)
+    }
+    input.split('\n').filter(|x| line_is_valid(x)).count()
+}
diff --git a/src/day3.rs b/src/day3.rs
new file mode 100644
index 0000000..58ba078
--- /dev/null
+++ b/src/day3.rs
@@ -0,0 +1,101 @@
+use std::convert::TryFrom;
+
+use aoc_runner_derive::{aoc, aoc_generator};
+
+#[derive(Debug)]
+pub enum MapSquare {
+    Open,
+    Tree,
+}
+
+impl TryFrom<u8> for MapSquare {
+    type Error = u8;
+    fn try_from(b: u8) -> Result<MapSquare, u8> {
+        Ok(match b {
+            b'.' => MapSquare::Open,
+            b'#' => MapSquare::Tree,
+            unknown => return Err(unknown),
+        })
+    }
+}
+
+#[aoc_generator(day3)]
+pub fn d3_input(input: &[u8]) -> Vec<Vec<MapSquare>> {
+    input
+        .split(|&b| b == b'\n')
+        .map(|line| {
+            line.iter()
+                .copied()
+                .map(|b| MapSquare::try_from(b).unwrap())
+                .collect()
+        })
+        .collect()
+}
+
+#[aoc(day3, part1)]
+pub fn solve_d3_p1(input: &[Vec<MapSquare>]) -> usize {
+    input
+        .iter()
+        .skip(1)
+        .enumerate()
+        .map(|(steps_taken, grid_line)| {
+            let x_coord = (steps_taken + 1) * 3;
+            match grid_line.iter().cycle().nth(x_coord).unwrap() {
+                MapSquare::Open => 0,
+                MapSquare::Tree => 1,
+            }
+        })
+        .sum()
+}
+
+#[aoc(day3, part2)]
+pub fn solve_d3_p2(input: &[Vec<MapSquare>]) -> usize {
+    #[derive(Debug, Clone, Copy)]
+    struct Step {
+        x_step: usize,
+        y_step: usize,
+    }
+
+    let steps = [
+        Step {
+            x_step: 1,
+            y_step: 1,
+        },
+        Step {
+            x_step: 3,
+            y_step: 1,
+        },
+        Step {
+            x_step: 5,
+            y_step: 1,
+        },
+        Step {
+            x_step: 7,
+            y_step: 1,
+        },
+        Step {
+            x_step: 1,
+            y_step: 2,
+        },
+    ];
+
+    steps
+        .iter()
+        .copied()
+        .map(|Step { x_step, y_step }| -> usize {
+            input
+                .iter()
+                .skip(y_step)
+                .step_by(y_step)
+                .enumerate()
+                .map(|(num_steps_taken, grid_line)| {
+                    let x_coord = (num_steps_taken + 1) * x_step;
+                    match grid_line.iter().cycle().nth(x_coord).unwrap() {
+                        MapSquare::Open => 0,
+                        MapSquare::Tree => 1,
+                    }
+                })
+                .sum()
+        })
+        .product()
+}
diff --git a/src/day4.rs b/src/day4.rs
new file mode 100644
index 0000000..959a60f
--- /dev/null
+++ b/src/day4.rs
@@ -0,0 +1,190 @@
+use std::str::FromStr;
+
+use aoc_runner_derive::aoc;
+
+#[derive(Debug)]
+struct BirthYear(u16);
+impl FromStr for BirthYear {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<BirthYear, ()> {
+        let year = s.parse().map_err(|_| ())?;
+        if year < 1920 || year > 2002 {
+            return Err(());
+        }
+        Ok(BirthYear(year))
+    }
+}
+
+#[derive(Debug)]
+struct IssueYear(u16);
+impl FromStr for IssueYear {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<IssueYear, ()> {
+        let year = s.parse().map_err(|_| ())?;
+        if year < 2010 || year > 2020 {
+            return Err(());
+        }
+        Ok(IssueYear(year))
+    }
+}
+
+#[derive(Debug)]
+struct ExpYear(u16);
+impl FromStr for ExpYear {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<ExpYear, ()> {
+        let year = s.parse().map_err(|_| ())?;
+        if year < 2020 || year > 2030 {
+            return Err(());
+        }
+        Ok(ExpYear(year))
+    }
+}
+
+#[derive(Debug)]
+struct HairColor(u32);
+impl FromStr for HairColor {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<HairColor, ()> {
+        let hex = s.strip_prefix("#").ok_or(())?;
+        let hcl = u32::from_str_radix(hex, 16).map_err(|_| ())?;
+        if hcl > 0xffffff {
+            return Err(());
+        }
+        Ok(HairColor(hcl))
+    }
+}
+
+#[derive(Debug)]
+enum Height {
+    Inches(u8),
+    Cm(u8),
+}
+impl FromStr for Height {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Height, ()> {
+        if let Some(cm) = s.strip_suffix("cm") {
+            let cm: u8 = cm.parse().map_err(|_| ())?;
+            if cm < 150 || cm > 193 {
+                return Err(());
+            }
+            Ok(Height::Cm(cm))
+        } else if let Some(inches) = s.strip_suffix("in") {
+            let inches: u8 = inches.parse().map_err(|_| ())?;
+            if inches < 59 || inches > 76 {
+                return Err(());
+            }
+            Ok(Height::Inches(inches))
+        } else {
+            Err(())
+        }
+    }
+}
+
+#[derive(Debug)]
+enum EyeColor {
+    Amber,
+    Blue,
+    Brown,
+    Gray,
+    Green,
+    Hazel,
+    Other,
+}
+impl FromStr for EyeColor {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<EyeColor, ()> {
+        Ok(match s {
+            "amb" => EyeColor::Amber,
+            "blu" => EyeColor::Blue,
+            "brn" => EyeColor::Brown,
+            "gry" => EyeColor::Gray,
+            "grn" => EyeColor::Green,
+            "hzl" => EyeColor::Hazel,
+            "oth" => EyeColor::Other,
+            _ => return Err(()),
+        })
+    }
+}
+
+#[derive(Debug)]
+struct PassportId(u32);
+impl FromStr for PassportId {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<PassportId, ()> {
+        if s.len() != 9 {
+            return Err(());
+        }
+        Ok(PassportId(s.parse().map_err(|_| ())?))
+    }
+}
+
+#[derive(Debug)]
+pub struct Passport<'a> {
+    byr: BirthYear,
+    iyr: IssueYear,
+    eyr: ExpYear,
+    hgt: Height,
+    hcl: HairColor,
+    ecl: EyeColor,
+    pid: PassportId,
+    cid: Option<&'a str>,
+}
+
+impl<'a> Passport<'a> {
+    fn parse(input: &'a str) -> Option<Self> {
+        fn parse_kv(input: &str) -> Option<(&str, &str)> {
+            let mut iter = input.split(':');
+            let k = iter.next()?;
+            let v = iter.next()?;
+            if iter.next().is_some() {
+                return None;
+            }
+            Some((k, v))
+        }
+
+        let mut byr = None;
+        let mut iyr = None;
+        let mut eyr = None;
+        let mut hgt = None;
+        let mut hcl = None;
+        let mut ecl = None;
+        let mut pid = None;
+        let mut cid = None;
+        for field in input.split_ascii_whitespace() {
+            match parse_kv(field) {
+                Some(("byr", value)) => byr = Some(value.parse().ok()?),
+                Some(("iyr", value)) => iyr = Some(value.parse().ok()?),
+                Some(("eyr", value)) => eyr = Some(value.parse().ok()?),
+                Some(("hgt", value)) => hgt = Some(value.parse().ok()?),
+                Some(("hcl", value)) => hcl = Some(value.parse().ok()?),
+                Some(("ecl", value)) => ecl = Some(value.parse().ok()?),
+                Some(("pid", value)) => pid = Some(value.parse().ok()?),
+                Some(("cid", value)) => cid = Some(value),
+                _ => return None,
+            }
+        }
+        Some(Passport {
+            byr: byr?,
+            iyr: iyr?,
+            eyr: eyr?,
+            hgt: hgt?,
+            hcl: hcl?,
+            ecl: ecl?,
+            pid: pid?,
+            cid,
+        })
+    }
+}
+
+#[aoc(day4, part2)]
+pub fn solve_d4_p2(input: &str) -> usize {
+    input.split("\n\n").filter_map(Passport::parse).count()
+}
diff --git a/src/day5.rs b/src/day5.rs
new file mode 100644
index 0000000..a77a6c2
--- /dev/null
+++ b/src/day5.rs
@@ -0,0 +1,86 @@
+use aoc_runner_derive::aoc;
+
+use std::fmt;
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd)]
+pub struct SeatId(u16);
+impl fmt::Display for SeatId {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        <Self as fmt::Debug>::fmt(self, f)
+    }
+}
+
+impl SeatId {
+    fn parse(input: &[u8]) -> Option<SeatId> {
+        if input.len() != 10 {
+            return None;
+        }
+        let mut seatid = 0u16;
+
+        for b in &input[..7] {
+            let value = match b {
+                b'F' => 0,
+                b'B' => 1,
+                _ => return None,
+            };
+            seatid = (seatid << 1) | value;
+        }
+
+        for b in &input[7..10] {
+            let value = match b {
+                b'L' => 0,
+                b'R' => 1,
+                _ => return None,
+            };
+            seatid = (seatid << 1) | value;
+        }
+        Some(SeatId(seatid))
+    }
+
+    fn row(&self) -> u8 {
+        (self.0 >> 3) as u8
+    }
+
+    fn column(&self) -> u8 {
+        (self.0 & 0b111) as u8
+    }
+}
+
+#[aoc(day5, part1)]
+pub fn solve_d5_p1(input: &[u8]) -> SeatId {
+    input
+        .split(|&b| b == b'\n')
+        .map(|i| SeatId::parse(i).unwrap())
+        .max()
+        .unwrap()
+}
+
+#[aoc(day5, part2)]
+pub fn solve_d5_p2(input: &[u8]) -> SeatId {
+    #[derive(Debug)]
+    struct MinMaxSum {
+        min: u16,
+        max: u16,
+        sum: u32,
+    }
+    let MinMaxSum { min, max, sum } = input
+        .split(|&b| b == b'\n')
+        .map(|i| SeatId::parse(i).unwrap())
+        .fold(
+            MinMaxSum {
+                min: u16::MAX,
+                max: 0,
+                sum: 0,
+            },
+            |MinMaxSum { min, max, sum }, seatid| MinMaxSum {
+                min: std::cmp::min(min, seatid.0),
+                max: std::cmp::max(max, seatid.0),
+                sum: sum + seatid.0 as u32,
+            },
+        );
+    let max = max as u32;
+    let min = min as u32;
+    let num_seats = max - min + 1;
+    let expected_sum = (max + min) * num_seats / 2;
+    SeatId((expected_sum - sum) as u16)
+}
diff --git a/src/day6.rs b/src/day6.rs
new file mode 100644
index 0000000..66fb4dc
--- /dev/null
+++ b/src/day6.rs
@@ -0,0 +1,76 @@
+use std::{iter::FromIterator, ops::BitAnd};
+
+use aoc_runner_derive::aoc;
+
+/// A set that can only contain b'a'..b'z';
+struct AlphabetSet(u32);
+impl AlphabetSet {
+    pub fn new() -> AlphabetSet {
+        AlphabetSet(0)
+    }
+
+    pub fn insert(&mut self, b: u8) {
+        self.0 |= 1 << Self::char_to_bit_index(b);
+    }
+
+    pub fn len(&self) -> usize {
+        self.0.count_ones() as usize
+    }
+
+    fn char_to_bit_index(b: u8) -> usize {
+        debug_assert!(b >= b'a' && b <= b'z');
+        (b as usize - 97) & 0x1f
+    }
+}
+
+// Do a set intersection with another set.
+impl std::ops::BitAndAssign for AlphabetSet {
+    fn bitand_assign(&mut self, rhs: AlphabetSet) {
+        self.0 &= rhs.0;
+    }
+}
+
+impl FromIterator<u8> for AlphabetSet {
+    fn from_iter<I>(iter: I) -> AlphabetSet
+    where
+        I: IntoIterator<Item = u8>,
+    {
+        let mut set = AlphabetSet::new();
+        for entry in iter {
+            set.insert(entry);
+        }
+        set
+    }
+}
+
+#[aoc(day6, part1)]
+pub fn solve_d6_p1(input: &str) -> usize {
+    input
+        .split("\n\n")
+        .map(|record| {
+            record
+                .split('\n')
+                .flat_map(|line| line.as_bytes())
+                .copied()
+                .collect::<AlphabetSet>()
+                .len()
+        })
+        .sum()
+}
+
+#[aoc(day6, part2)]
+pub fn solve_d6_p2(input: &str) -> usize {
+    input
+        .split("\n\n")
+        .map(|record| {
+            let mut line_iter = record
+                .split('\n')
+                .map(|line| line.as_bytes().iter().copied().collect::<AlphabetSet>());
+            let mut group_set = line_iter.next().unwrap();
+            for set in line_iter {
+                group_set &= set;
+            }
+            group_set.len()
+        })
+        .sum()
+}
diff --git a/src/lib.rs b/src/lib.rs
index 0940312..fedaca3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,164 +1,8 @@
-use std::convert::TryFrom;
+pub mod day1;
+pub mod day2;
+pub mod day3;
+pub mod day4;
+pub mod day5;
+pub mod day6;
 
-use aoc_runner_derive::{aoc, aoc_generator, aoc_lib};
-
-#[aoc_generator(day1)]
-pub fn d1_input(input: &str) -> Vec<u64> {
-    let mut entries: Vec<u64> = input.split('\n').map(|x| x.parse().unwrap()).collect();
-    entries.sort();
-    entries
-}
-
-#[aoc(day1, part1)]
-pub fn solve_d1_p1(input: &[u64]) -> u64 {
-    for entry in input {
-        let needed = 2020 - entry;
-        if let Ok(idx) = input.binary_search(&needed) {
-            return entry * input[idx];
-        }
-    }
-    panic!("not found");
-}
-
-#[aoc(day1, part2)]
-pub fn solve_d1_p2(input: &[u64]) -> Option<u64> {
-    for i in 0..input.len() - 2 {
-        let entry1 = input[i];
-        for j in i + 1..input.len() - 1 {
-            let entry2 = input[j];
-            if entry1 + entry2 > 2020 {
-                break;
-            }
-            for k in j + 1..input.len() {
-                let entry3 = input[k];
-                if entry1 + entry2 + entry3 == 2020 {
-                    return Some(entry1 * entry2 * entry3);
-                }
-            }
-        }
-    }
-    return None;
-}
-
-struct PasswdEntry<'a> {
-    lower_bound: usize,
-    upper_bound: usize,
-    policy_char: u8,
-    passwd: &'a [u8],
-}
-
-impl<'a> PasswdEntry<'a> {
-    fn parse(mut input: &'a str) -> Option<Self> {
-        let lb_idx = input.find('-')?;
-        let lower_bound: usize = (&input[..lb_idx]).parse().ok()?;
-        input = &input[lb_idx + 1..];
-
-        let ub_idx = input.find(' ')?;
-        let upper_bound: usize = (&input[..ub_idx]).parse().ok()?;
-        input = &input[ub_idx + 1..];
-
-        let policy_char = input.as_bytes()[0];
-        let passwd = &input[3..].as_bytes();
-        Some(PasswdEntry { lower_bound, upper_bound, policy_char, passwd })
-    }
-}
-
-#[aoc(day2, part1)]
-pub fn solve_d2_p1(input: &str) -> usize {
-    fn line_is_valid(line: &str) -> bool {
-        let entry = PasswdEntry::parse(line).unwrap();
-        let count = entry.passwd.iter().filter(|&&b| b == entry.policy_char).count();
-        (count >= entry.lower_bound) && (count <= entry.upper_bound)
-    }
-    input.split('\n').filter(|x| line_is_valid(x)).count()
-}
-
-#[aoc(day2, part2)]
-pub fn solve_d2_p2(input: &str) -> usize {
-    fn line_is_valid(line: &str) -> bool {
-        let entry = PasswdEntry::parse(line).unwrap();
-        (entry.passwd[entry.lower_bound - 1] == entry.policy_char)
-            ^ (entry.passwd[entry.upper_bound - 1] == entry.policy_char)
-    }
-    input.split('\n').filter(|x| line_is_valid(x)).count()
-}
-
-#[derive(Debug)]
-pub enum MapSquare {
-    Open,
-    Tree,
-}
-
-impl TryFrom<u8> for MapSquare {
-    type Error = u8;
-    fn try_from(b: u8) -> Result<MapSquare, u8> {
-        Ok(match b {
-            b'.' => MapSquare::Open,
-            b'#' => MapSquare::Tree,
-            unknown => return Err(unknown),
-        })
-    }
-}
-
-#[aoc_generator(day3)]
-pub fn d3_input(input: &[u8]) -> Vec<Vec<MapSquare>> {
-    input
-        .split(|&b| b == b'\n')
-        .map(|line| line.iter().copied().map(|b| MapSquare::try_from(b).unwrap()).collect())
-        .collect()
-}
-
-#[aoc(day3, part1)]
-pub fn solve_d3_p1(input: &[Vec<MapSquare>]) -> usize {
-    input
-        .iter()
-        .skip(1)
-        .enumerate()
-        .map(|(steps_taken, grid_line)| {
-            let x_coord = (steps_taken + 1) * 3;
-            match grid_line.iter().cycle().nth(x_coord).unwrap() {
-                MapSquare::Open => 0,
-                MapSquare::Tree => 1,
-            }
-        })
-        .sum()
-}
-
-#[aoc(day3, part2)]
-pub fn solve_d3_p2(input: &[Vec<MapSquare>]) -> usize {
-    #[derive(Debug, Clone, Copy)]
-    struct Step {
-        x_step: usize,
-        y_step: usize,
-    }
-
-    let steps = [
-        Step { x_step: 1, y_step: 1 },
-        Step { x_step: 3, y_step: 1 },
-        Step { x_step: 5, y_step: 1 },
-        Step { x_step: 7, y_step: 1 },
-        Step { x_step: 1, y_step: 2 },
-    ];
-
-    steps
-        .iter()
-        .copied()
-        .map(|Step { x_step, y_step }| -> usize {
-            input
-                .iter()
-                .skip(y_step)
-                .step_by(y_step)
-                .enumerate()
-                .map(|(num_steps_taken, grid_line)| {
-                    let x_coord = (num_steps_taken + 1) * x_step;
-                    match grid_line.iter().cycle().nth(x_coord).unwrap() {
-                        MapSquare::Open => 0,
-                        MapSquare::Tree => 1,
-                    }
-                })
-                .sum()
-        })
-        .product()
-}
-
-aoc_lib! { year = 2020 }
+aoc_runner_derive::aoc_lib! { year = 2020 }