Day 7 part 1

2019/input/day7.txt

@@ -0,0 +1 @@
+3,8,1001,8,10,8,105,1,0,0,21,42,55,64,77,94,175,256,337,418,99999,3,9,102,4,9,9,1001,9,5,9,102,2,9,9,101,3,9,9,4,9,99,3,9,102,2,9,9,101,5,9,9,4,9,99,3,9,1002,9,4,9,4,9,99,3,9,102,4,9,9,101,5,9,9,4,9,99,3,9,102,5,9,9,1001,9,3,9,1002,9,5,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,101,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,1001,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,1001,9,1,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,99,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,99,3,9,1001,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,99

2019/src/bin/day4.rs

@@ -1,3 +1,4 @@
+use advent_of_code::number_to_digits;
 use std::ops::RangeInclusive;
 
 const INPUT: RangeInclusive<u32> = 356261..=846303;
@@ -43,16 +44,6 @@ fn meets_criteria_part2(number: &u32) -> bool {
     chunks.iter().any(|chunk| chunk.len() == 2) && digits.windows(2).all(|pair| pair[1] >= pair[0])
 }
 
-fn number_to_digits(mut number: u32) -> [u8; 6] {
-    let mut digits = [0; 6];
-    digits.iter_mut().rev().for_each(|digit| {
-        *digit = (number % 10) as u8;
-        number /= 10;
-    });
-
-    digits
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;

2019/src/bin/day7.rs

@@ -0,0 +1,76 @@
+use std::{fs, io};
+
+use advent_of_code::{computer, input};
+
+const AMPLIFIERS: usize = 5;
+
+fn main() -> io::Result<()> {
+    let source = fs::read_to_string("input/day7.txt")?;
+    let data = input::read_separated_line(',', &source)?;
+
+    let max = phase_settings()
+        .iter()
+        .map(|settings| {
+            let mut output = 0;
+            for phase_setting in settings.iter() {
+                let input = vec![output, *phase_setting];
+                let mut program = data.clone();
+                let mut computer = computer::Computer::new(&mut program, input);
+                computer.run(None, None);
+                output = computer.output()[0];
+            }
+            output
+        })
+        .max()
+        .unwrap();
+    println!("Part 1: {}", max);
+
+    Ok(())
+}
+
+fn phase_settings() -> Vec<[i32; AMPLIFIERS]> {
+    let mut permutations = Vec::new();
+    let mut indexes = [0i32; AMPLIFIERS];
+    let mut elements = [0i32; AMPLIFIERS];
+    for i in 0i32..=4 {
+        elements[i as usize] = i;
+    }
+
+    permutations.push(elements);
+
+    let mut i = 0;
+    while i < AMPLIFIERS {
+        if indexes[i] < i as i32 {
+            elements.swap(if i % 2 == 0 { 0 } else { indexes[i] as usize }, i);
+            permutations.push(elements);
+            indexes[i] += 1;
+            i = 0;
+        } else {
+            indexes[i] = 0;
+            i += 1;
+        }
+    }
+
+    permutations
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_phase_setting_generation() {
+        let settings = phase_settings();
+        assert_eq!(
+            &settings[0..6],
+            &[
+                [0, 1, 2, 3, 4],
+                [1, 0, 2, 3, 4],
+                [2, 0, 1, 3, 4],
+                [0, 2, 1, 3, 4],
+                [1, 2, 0, 3, 4],
+                [2, 1, 0, 3, 4]
+            ]
+        );
+    }
+}

2019/src/computer.rs

@@ -188,7 +188,7 @@ mod tests {
     fn test_day2() {
         let input = fs::read_to_string("input/day2.txt").unwrap();
         let mut data = input::read_separated_line(',', &input).unwrap();
-        let mut program = Computer::new(&mut data);
+        let mut program = Computer::new(&mut data, vec![]);
 
         // Check that day2 still works wirh run through this implementation
         program.run(Some(12), Some(2));

2019/src/lib.rs

@@ -1,3 +1,35 @@
 pub mod computer;
 pub mod input;
 pub mod point;
+
+pub fn number_to_digits(mut number: u32) -> [u8; 6] {
+    let mut digits = [0; 6];
+    digits.iter_mut().rev().for_each(|digit| {
+        *digit = (number % 10) as u8;
+        number /= 10;
+    });
+
+    digits
+}
+
+pub fn quinary(upto: u32) -> Vec<[u8; 5]> {
+    let limit = number_to_digits(upto);
+    let mut result = Vec::new();
+
+    let mut counter = [0; 5];
+    while &counter != &limit[1..] {
+        result.push(counter);
+        counter[0] += 1;
+        for i in 0..5 {
+            if counter[i] == 5 {
+                counter[i] = 0;
+                counter[i + 1] += 1;
+            } else {
+                break;
+            }
+        }
+    }
+    result.push(counter);
+
+    result
+}