rust/2021/src/day_03.rs

@@ -1,55 +1,9 @@
-fn solve_part1(input: &str) -> u32 {
-    let (report, bit_len) = parse_input(input);
-    let mut gamma: u32 = 0;
-
-    for i in 0..bit_len {
-        let count = report.iter().filter(|v| **v >> i & 0x01 == 0x01).count();
-
-        if count > report.len() - count {
-            gamma |= 1 << i
-        } else {
-            gamma &= !(1 << i)
-        }
+fn solve_part1(input: &str) -> i32 {
+    todo!();
 }
 
-    gamma * (!gamma & ((1 << bit_len) - 1))
-}
-
-fn solve_part2(input: &str) -> u32 {
-    let (oxy_gen, bit_len) = parse_input(input);
-    let co2_gen = oxy_gen.clone();
-
-    let left = part2_logic(oxy_gen, bit_len, true);
-    let right = part2_logic(co2_gen, bit_len, false);
-
-    left * right
-}
-
-fn part2_logic(mut gen: Vec<u16>, bit_len: usize, is_oxy: bool) -> u32 {
-    for i in 0..bit_len {
-        if gen.len() < 2 {
-            break;
-        }
-
-        let count = gen
-            .iter()
-            .filter(|v| **v >> (bit_len - 1 - i) & 0x01 == 0x01)
-            .count();
-
-        let common = (count >= gen.len() - count) as u16;
-        let needle = if is_oxy { 1 - common } else { common };
-        gen.retain(|v| *v >> (bit_len - 1 - i) & 0x01 == needle);
-    }
-
-    gen[0] as u32
-}
-
-fn parse_input(input: &str) -> (Vec<u16>, usize) {
-    let mut it = input.lines().peekable();
-    let size = it.peek().expect("1 > &str exists").len();
-    let report = it.flat_map(|s| u16::from_str_radix(s, 2).ok()).collect();
-
-    (report, size)
+fn solve_part2(input: &str) -> i32 {
+    todo!();
 }
 
 pub fn run(input: String) {
@@ -62,16 +16,15 @@ pub fn run(input: String) {
 
 #[cfg(test)]
 mod tests {
-    const EXAMPLE_INPUT: &str =
-        "00100\n11110\n10110\n10111\n10101\n01111\n00111\n11100\n10000\n11001\n00010\n01010";
+    const EXAMPLE_INPUT: &str = todo!();
 
     #[test]
     fn part1() {
-        assert_eq!(super::solve_part1(EXAMPLE_INPUT), 198);
+        todo!();
     }
 
     #[test]
     fn part2() {
-        assert_eq!(super::solve_part2(EXAMPLE_INPUT), 230);
+        todo!();
     }
 }

rust/2021/src/day_04.rs

@@ -1,30 +0,0 @@
-fn solve_part1(input: &str) -> i32 {
-    todo!();
-}
-
-fn solve_part2(input: &str) -> i32 {
-    todo!();
-}
-
-pub fn run(input: String) {
-    println!("--- Part 1 ---");
-    println!("Answer: {}", solve_part1(&input));
-    println!();
-    println!("--- Part 2 ---");
-    println!("Answer: {}", solve_part2(&input))
-}
-
-#[cfg(test)]
-mod tests {
-    const EXAMPLE_INPUT: &str = todo!();
-
-    #[test]
-    fn part1() {
-        todo!();
-    }
-
-    #[test]
-    fn part2() {
-        todo!();
-    }
-}

rust/2021/src/lib.rs

@@ -1,10 +1,9 @@
 mod day_01;
 mod day_02;
 mod day_03;
-mod day_04;
 
-pub const INPUT_PATH: &str = "./input/2021/day4.txt";
+pub const INPUT_PATH: &str = "./input/2021/day3.txt";
 
 pub fn run(input: String) {
-    day_04::run(input);
+    day_03::run(input);
 }