day06

3 files changed, 66 insertions, 0 deletions

diff --git a/2023/day06.rs b/2023/day06.rs
new file mode 100644
index 0000000..7ba165e
--- /dev/null
+++ b/2023/day06.rs
@@ -0,0 +1,62 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+#![allow(unused_mut)]
+use std::fs::File;
+use std::io::Read;
+
+fn get_opts(t: u64, d: u64) -> u64 {
+    let mut opts = 0;
+    for wait in 0..t {
+        if wait * (t - wait) > d {
+            opts += 1;
+        }
+    }
+    return opts;
+}
+
+fn main() {
+    // let filename = "in/day06.ref";
+    let filename = "in/day06.pzl";
+
+    let mut f = File::open(filename).expect("cannot open file");
+    let mut content = String::new();
+    f.read_to_string(&mut content).expect("cannot read file");
+
+    let mut lines = content.trim_end().split('\n');
+    let parse1 = |l: &str| {
+        l.split_once(":")
+            .unwrap()
+            .1
+            .split(" ")
+            .filter_map(|x| x.parse::<u64>().ok())
+            .collect::<Vec<u64>>()
+    };
+    let time = parse1(lines.next().unwrap());
+    let dist = parse1(lines.next().unwrap());
+    let res1 = time
+        .into_iter()
+        .zip(dist.into_iter())
+        .map(|(t, d)| get_opts(t, d))
+        .fold(1, |acc, x| acc * x);
+
+    let mut lines = content.trim_end().split('\n');
+    let parse1 = |l: &str| {
+        l.split_once(":")
+            .unwrap()
+            .1
+            .split(" ")
+            .filter(|s| !s.is_empty())
+            .collect::<Vec<_>>()
+            .join("")
+            .parse::<u64>()
+            .unwrap()
+    };
+    let time = parse1(lines.next().unwrap());
+    let dist = parse1(lines.next().unwrap());
+    let res2 = get_opts(time, dist);
+
+    println!("res1: {}", res1);
+    println!("res2: {}", res2);
+    assert_eq!(res1, 220320);
+    assert_eq!(res2, 34454850);
+}
diff --git a/2023/in/day06.pzl b/2023/in/day06.pzl
new file mode 100644
index 0000000..01c2b63
--- /dev/null
+++ b/2023/in/day06.pzl
@@ -0,0 +1,2 @@
+Time:        59     79     65     75
+Distance:   597   1234   1032   1328
diff --git a/2023/in/day06.ref b/2023/in/day06.ref
new file mode 100644
index 0000000..28f5ae9
--- /dev/null
+++ b/2023/in/day06.ref
@@ -0,0 +1,2 @@
+Time:      7  15   30
+Distance:  9  40  200