Added other 2 days

Cargo.lock

@@ -3,4 +3,23 @@
 [[package]]
 name = "AoC2020"
 version = "0.1.0"
+dependencies = [
+ "itertools 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
+[[package]]
+name = "either"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "itertools"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "either 1.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[metadata]
+"checksum either 1.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+"checksum itertools 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"

Cargo.toml

@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+itertools = "0.9.0"

inputs/day1.txt

@@ -0,0 +1,200 @@
+1962
+1577
+1750
+1836
+1762
+1691
+1726
+1588
+1370
+1043
+1307
+1552
+1813
+1804
+1765
+1893
+1610
+764
+1512
+1404
+1711
+1000
+1694
+1546
+1880
+1721
+2006
+1787
+1510
+1850
+1420
+1712
+1926
+1707
+1983
+1680
+1436
+389
+1448
+1875
+1333
+1733
+1935
+1794
+1337
+1863
+1769
+1635
+1499
+1807
+1326
+1989
+1705
+1673
+1829
+1684
+1716
+456
+1696
+1398
+1942
+1851
+1690
+1328
+1356
+1775
+1564
+1466
+1273
+1896
+766
+1814
+1810
+1537
+1463
+1755
+1341
+1665
+1520
+1366
+1387
+1976
+1717
+1737
+1551
+1760
+1496
+1664
+1450
+1319
+1674
+1630
+1301
+1330
+1658
+1637
+1655
+1439
+1832
+1948
+1339
+1656
+1449
+1296
+1489
+1758
+1939
+1857
+1402
+1394
+1882
+1446
+1412
+1430
+1212
+1377
+1501
+1873
+1812
+1667
+1560
+1654
+1575
+1999
+1581
+1792
+1299
+1843
+1383
+1351
+1297
+1822
+1801
+1977
+1316
+1477
+1980
+1693
+1220
+1554
+1607
+1903
+1669
+1593
+1955
+1286
+1909
+1280
+1854
+2005
+1820
+1803
+1763
+1660
+1410
+1974
+1808
+1816
+1723
+1936
+1423
+1818
+1800
+1294
+857
+496
+1248
+1670
+1993
+1929
+1966
+1381
+1259
+1285
+1797
+1644
+1919
+1267
+1509
+399
+1300
+1662
+1556
+1747
+1517
+1972
+1729
+1506
+1544
+1957
+1930
+1956
+1753
+1284
+1389
+1689
+1709
+1627
+1770
+847

src/bin/day1.rs

@@ -0,0 +1,27 @@
+use itertools::Itertools;
+use std::error::Error;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::vec::Vec;
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let file = File::open("inputs/day1.txt")?;
+    let lines = io::BufReader::new(file).lines();
+
+    let numbers: Vec<u32> = lines.map(|l| l.unwrap().parse().unwrap()).collect();
+
+    let count = 3;
+
+    for combo in numbers.iter().combinations(count) {
+        if combo.iter().fold(0u32, |acc, x| acc + **x) == 2020 {
+            println!(
+                "Combo: {:?} == {}",
+                combo,
+                combo.iter().fold(1u32, |acc, x| acc * **x)
+            );
+            break;
+        }
+    }
+
+    Ok(())
+}

src/bin/day2.rs

@@ -0,0 +1,38 @@
+use itertools::Itertools;
+use std::error::Error;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::vec::Vec;
+
+fn is_valid(line: &Vec<String>) -> bool {
+    let min: usize = line[0].parse().unwrap();
+    let max: usize = line[1].parse().unwrap();
+    let policy_char = line[2].chars().nth(0).unwrap();
+
+    let count = line[3].matches(policy_char).count();
+
+    count >= min && count <= max
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let file = File::open("inputs/day2.txt")?;
+    let lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
+
+    let parts: Vec<Vec<String>> = lines
+        .map(|l| {
+            l.split(|c| c == ' ' || c == ':' || c == '-')
+                .filter(|s| *s != "")
+                .map(|s| s.to_string())
+                .collect()
+        })
+        .collect();
+
+    let valid_count = parts
+        .iter()
+        .map(|p| if is_valid(p) { 1 } else { 0 })
+        .fold(0, |acc, x| acc + x);
+
+    println!("Total valid: {}", valid_count);
+
+    Ok(())
+}

src/bin/day2_part2.rs

@@ -0,0 +1,44 @@
+use itertools::Itertools;
+use std::error::Error;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::vec::Vec;
+
+fn is_valid(line: &Vec<String>) -> bool {
+    let pos1: usize = line[0].parse().unwrap();
+    let pos2: usize = line[1].parse().unwrap();
+    let policy_char = line[2].chars().nth(0).unwrap();
+
+    let char1 = line[3].chars().nth(pos1-1);
+    let char2 = line[3].chars().nth(pos2-1);
+
+    match (char1, char2) {
+        (Some(c1), Some(c2)) => (c1 == policy_char) ^ (c2 == policy_char),
+        (Some(c), None) => (c == policy_char),
+        (None, Some(c)) => (c == policy_char),
+        (None, None) => false,
+    }
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let file = File::open("inputs/day2.txt")?;
+    let lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
+
+    let parts: Vec<Vec<String>> = lines
+        .map(|l| {
+            l.split(|c| c == ' ' || c == ':' || c == '-')
+                .filter(|s| *s != "")
+                .map(|s| s.to_string())
+                .collect()
+        })
+        .collect();
+
+    let valid_count = parts
+        .iter()
+        .map(|p| if is_valid(p) { 1 } else { 0 })
+        .fold(0, |acc, x| acc + x);
+
+    println!("Total valid: {}", valid_count);
+
+    Ok(())
+}

src/bin/day3.rs

@@ -4,7 +4,7 @@ use std::io::{self, BufRead};
 use std::vec::Vec;
 
 fn main() -> Result<(), Box<dyn Error>> {
-    let file = File::open("inputs/problem3.txt")?;
+    let file = File::open("inputs/day3.txt")?;
     let lines = io::BufReader::new(file).lines();
 
     let trees: Vec<Vec<bool>> = lines