add: d05 & debug utils

- includes a script to generate a 2GB big challenge
- added utils to internally time functions with minimal overhead
- add functionality to tester.rs

2025/05/p2.rs

@@ -0,0 +1,35 @@
+pub type RangeU = usize;
+
+#[unsafe(no_mangle)]
+extern "Rust" fn challenge_usize(buf: &[u8]) -> usize {
+    let s = unsafe { str::from_utf8_unchecked(buf) };
+    let mut lines = s.lines();
+
+    let mut ranges: Vec<(RangeU, RangeU)> = Vec::new();
+
+    for range in &mut lines {
+        if range.is_empty() {
+            break;
+        }
+
+        let (l, r) = range.split_once('-').unwrap();
+        let (l, r) = (l.parse().unwrap(), r.parse().unwrap());
+
+        ranges.push((l, r));
+    }
+
+    ranges.sort_by(|a, b| a.0.cmp(&b.0));
+    ranges
+        .into_iter()
+        .fold((0, 0), |(count, rightmost), (l, r)| {
+            // dbg!((rightmost, r));
+            if rightmost >= r {
+                (count, rightmost)
+            } else if rightmost >= l {
+                let overlap = rightmost - l + 1;
+                (count + r - l - overlap + 1, rightmost.max(r))
+            } else {
+                (count + r - l + 1, r)
+            }
+        }).0
+}