Add day6

1 files changed, 102 insertions, 0 deletions

diff --git a/2023/day6/src/lib.rs b/2023/day6/src/lib.rs
new file mode 100644
index 0000000..b3e33cb
--- /dev/null
+++ b/2023/day6/src/lib.rs
@@ -0,0 +1,102 @@
+pub fn part1(input: &str) -> u64 {
+    let mut res: u64 = 1;
+
+    let td: Vec<Vec<_>> = input
+        .trim_end()
+        .split('\n')
+        .map(|x| {
+            x.split(':')
+                .nth(1)
+                .unwrap()
+                .trim()
+                .replace("    ", " ")
+                .replace("   ", " ")
+                .replace("  ", " ")
+                .split(' ')
+                .map(|y| y.parse::<u64>().unwrap())
+                .collect()
+        })
+        .collect();
+
+    assert_eq!(td.len(), 2);
+    let (t, d) = (&td[0], &td[1]);
+
+    for i in 0..t.len() {
+        let mut r = 0;
+        for j in 0..t[i] {
+            if (t[i] - j) * j > d[i] {
+                r += 1;
+            }
+        }
+        res *= r;
+    }
+
+    res
+}
+
+pub fn part2(input: &str) -> u64 {
+    let mut res: u64 = 1;
+
+    let td: Vec<Vec<_>> = input
+        .trim_end()
+        .split('\n')
+        .map(|x| {
+            x.split(':')
+                .nth(1)
+                .unwrap()
+                .trim()
+                .replace(" ", "")
+                .split(' ')
+                .map(|y| y.parse::<u64>().unwrap())
+                .collect()
+        })
+        .collect();
+
+    assert_eq!(td.len(), 2);
+    let (t, d) = (&td[0], &td[1]);
+
+    for i in 0..t.len() {
+        let mut r = 0;
+        for j in 0..t[i] {
+            if (t[i] - j) * j > d[i] {
+                r += 1;
+            }
+        }
+        res *= r;
+    }
+
+    res
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn example_part1() {
+        let input = include_str!("../example.txt");
+        let result = part1(input);
+        assert_eq!(result, 288);
+    }
+
+    #[test]
+    fn input_part1() {
+        let input = include_str!("../input.txt");
+        let result = part1(input);
+        assert_eq!(result, 74698);
+    }
+
+    #[test]
+    fn example_part2() {
+        let input = include_str!("../example.txt");
+        let result = part2(input);
+        assert_eq!(result, 71503);
+    }
+
+    #[test]
+    fn input_part2() {
+        let input = include_str!("../input.txt");
+        let result = part2(input);
+        assert_eq!(result, 27563421);
+    }
+}