initial commit, includes days 1 and 2 solutions

2020-12-02 15:21:56 -08:00
commit 71e7c5e90d
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+/target
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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+1-6 q: fphqvm
+9-12 p: pvprppdtpxsjbpmmppp
+4-5 x: xxxqmx
+1-9 d: ddpjdcmbdstn
+1-3 g: gggg
+2-4 w: wlclwzf
+5-11 f: ffffbzfnwfh
+2-4 v: vhvhj
+1-4 h: hqskhghrznfkkg
+2-6 b: bxbbtk
+2-4 x: xxxx
+7-8 w: wwwwwqnxwww
+2-12 h: hshhnhhxlbfchhhdhhsh
+16-17 q: qqqqfqqcqdqqtqqcf
+9-12 t: ttttttttjttt
+1-3 m: hdzdvv
+5-14 r: rmrkrbrrlrrrhwrrpkr
+4-6 g: gggggx
+15-16 r: rrrtrrrrrrrrrrtp
+5-13 q: mzqtnknqzqgqhqdkwmlf
+13-14 d: ddddddddvdddddd
+4-5 p: ppprzr
+7-8 z: zzxzzzfjz
+8-9 c: ccgzcccmhcc
+4-5 x: hxxxxq
+1-3 t: ttttttpttltt
+11-14 h: hhchhbtvfvjhhr
+7-8 r: brrrrrmrrr
+8-12 v: vvvvvvvnvvvf
+5-6 l: nddlllwlllll
+13-14 k: kkkkkfvkkkklmwkk
+8-10 t: tttttttttt
+2-9 k: jbrxrwkhkh
+4-5 p: hpppp
+10-12 z: zzzzzzzzzzzfzz
+2-8 c: cqxkjkdhkgsdddtvt
+1-5 d: dddsdhd
+4-13 v: vvxlvvvvvvvvgvv
+1-4 q: pqqv
+3-4 k: krrk
+6-8 v: cdvvvxvhvvvvv
+1-3 d: ddddtd
+10-11 b: bbbbbbbbbpj
+9-16 d: ddrddddgdcddddddd
+9-10 k: llrctckdkkv
+8-11 f: jnffzfrffgffsfwfvkkj
+8-13 d: dbddnddnjdmjdddkdd
+5-6 b: bbbbhzbz
+2-11 h: hhvghhhhhhh
+15-16 q: qqqqqnqtqqqbqxqlqqcq
+4-5 k: kkkdw
+10-16 j: jqvhdjgmkjckjlpg
+6-11 q: vqdnfbqqgqmqqqqq
+8-11 q: qqrqqqqqlkq
+8-11 v: wvvvvvvvfvvvrvvj
+8-13 s: ssssssssscsfsss
+6-8 w: pwwtwwlwwhww
+8-9 f: ffffjfflb
+2-4 v: jvgxmphvr
+2-6 r: rrzrcd
+10-16 n: lvknnwnnvsmnnnnhn
+12-13 r: rrrpjrrrrrrtfrkwmr
@@ -0,0 +1,2 @@
+1016131
+276432018
@@ -0,0 +1,2 @@
+622
+263
@@ -0,0 +1,41 @@
+// ==== day 1
+
+use crate::utils;
+use anyhow::{anyhow, Result};
+
+fn day01_part1(data: &[i64]) -> Result<i64> {
+    for i in 0..data.len() - 2 {
+        for j in i + 1..data.len() - 1 {
+            if data[i] + data[j] == 2020 {
+                return Ok(data[i] * data[j]);
+            }
+        }
+    }
+    Err(anyhow!("no result found"))
+}
+
+fn day01_part2(data: &[i64]) -> Result<i64> {
+    for i in 0..data.len() - 3 {
+        for j in i + 1..data.len() - 2 {
+            for k in j + 1..data.len() - 1 {
+                if data[i] + data[j] + data[k] == 2020 {
+                    return Ok(data[i] * data[j] * data[k]);
+                }
+            }
+        }
+    }
+    Err(anyhow!("no result found"))
+}
+
+pub fn run() -> Result<(i64, i64)> {
+    let data = utils::read_i64s("data/input-01.txt")?;
+    let answers = utils::read_i64s("data/output-01.txt")?;
+
+    let p1 = day01_part1(&data)?;
+    assert_eq!(p1, answers[0]);
+
+    let p2 = day01_part2(&data)?;
+    assert_eq!(p2, answers[1]);
+
+    Ok((p1, p2))
+}
@@ -0,0 +1,48 @@
+// ==== day 2
+
+use crate::utils;
+use anyhow::Result;
+use regex::Regex;
+
+struct PasswordSpec {
+    min: usize,
+    max: usize,
+    required: char,
+    password: String,
+}
+
+fn valid_password_1(p: &PasswordSpec) -> bool {
+    let count = p.password.chars().filter(|c| c == &p.required).count();
+    p.min <= count && count <= p.max
+}
+
+fn valid_password_2(p: &PasswordSpec) -> bool {
+    let char_a = p.password.chars().nth(p.min - 1).unwrap();
+    let char_b = p.password.chars().nth(p.max - 1).unwrap();
+    (char_a == p.required) ^ (char_b == p.required)
+}
+
+pub fn run() -> Result<(usize, usize)> {
+    let data = utils::read_file("data/input-02.txt")?;
+    let answers = utils::read_i64s("data/output-02.txt")?;
+
+    // parse lines like "4-8 n: dnjjrtclnzdnghnbnn" into vector of PasswordSpec{}
+    let re = Regex::new(r"(\d+)-(\d+) +([a-z]): +(\S*)")?;
+    let pwspecs: Vec<PasswordSpec> = re
+        .captures_iter(&data)
+        .map(|cap| PasswordSpec {
+            min: cap[1].parse().expect("parse error"),
+            max: cap[2].parse().expect("parse error"),
+            required: cap[3].chars().next().expect("string index error"),
+            password: (&cap[4]).to_string(),
+        })
+        .collect();
+
+    let p1 = pwspecs.iter().filter(|p| valid_password_1(&p)).count();
+    assert_eq!(p1, answers[0] as usize);
+
+    let p2 = pwspecs.iter().filter(|p| valid_password_2(&p)).count();
+    assert_eq!(p2, answers[1] as usize);
+
+    Ok((p1, p2))
+}
@@ -0,0 +1,18 @@
+use anyhow::Result;
+
+mod day01;
+mod day02;
+mod utils;
+
+// TODO
+// ====
+// * move from i64 to something else that works with the data+problems, int, i32, usize?
+// * clean up error handling (move to `?` inside closures)
+
+// ==== main()
+
+fn main() -> Result<()> {
+    println!("Day 01: {:?}", day01::run()?);
+    println!("Day 02: {:?}", day02::run()?);
+    Ok(())
+}
@@ -0,0 +1,15 @@
+// ==== utilities
+
+use anyhow::Result;
+use std::fs;
+
+pub fn read_i64s(filename: &str) -> Result<Vec<i64>> {
+    Ok(read_file(filename)?
+        .lines()
+        .map(|s| s.parse::<i64>().expect("i64 parse error"))
+        .collect())
+}
+
+pub fn read_file(filename: &str) -> Result<String> {
+    Ok(fs::read_to_string(filename)?)
+}