add until day05-1

day03/src/main.rs

@@ -0,0 +1,69 @@
+use std::collections::HashSet;
+
+#[cfg(debug_assertions)]
+const FILENAME: &str = "example.txt";
+#[cfg(not(debug_assertions))]
+const FILENAME: &str = "input.txt";
+
+fn main() {
+    let data = std::fs::read_to_string(FILENAME).unwrap();
+
+    part_1(&data);
+    part_2(&data);
+}
+
+fn part_2(data: &str) {
+    let mut hs = HashSet::new();
+
+    let mut xs: isize = 0;
+    let mut ys: isize = 0;
+
+    let mut xr: isize = 0;
+    let mut yr: isize = 0;
+
+    hs.insert((xs, ys));
+
+    for (idx, c) in data.trim().chars().enumerate() {
+        let x;
+        let y;
+        if idx % 2 == 0 {
+            x = &mut xs;
+            y = &mut ys;
+        } else {
+            x = &mut xr;
+            y = &mut yr;
+        }
+        match c {
+            '^' => *y += 1,
+            '>' => *x += 1,
+            '<' => *x -= 1,
+            'v' => *y -= 1,
+            _ => unreachable!(),
+        };
+        hs.insert((*x, *y));
+    }
+
+    println!("{}", hs.len());
+}
+
+fn part_1(data: &str) {
+    let mut hs = HashSet::new();
+
+    let mut x: isize = 0;
+    let mut y: isize = 0;
+
+    hs.insert((x, y));
+
+    for c in data.trim().chars() {
+        match c {
+            '^' => y += 1,
+            '>' => x += 1,
+            '<' => x -= 1,
+            'v' => y -= 1,
+            _ => unreachable!(),
+        };
+        hs.insert((x, y));
+    }
+
+    println!("{}", hs.len());
+}