1 files changed, 47 insertions, 0 deletions
diff --git a/10/src/part-1.rs b/10/src/part-1.rs
new file mode 100644
index 0000000..c066310
--- /dev/null
+++ b/10/src/part-1.rs
@@ -0,0 +1,47 @@
+use std::io::{BufRead};
+
+const SCORES: [usize; 4] = [3, 57, 1197, 25137];
+
+fn num(c: char) -> usize {
+    match c {
+        '(' => 0,
+        '[' => 1,
+        '{' => 2,
+        '<' => 3,
+        ')' => 4,
+        ']' => 5,
+        '}' => 6,
+        '>' => 7,
+        _   => panic!("Unknown character: {}", c)
+    }
+}
+
+pub fn main() {
+    let stdin = std::io::stdin();
+    let handle = stdin.lock();
+
+    let mut score: usize = 0;
+    for l in handle.lines() {
+        let line = l.unwrap();
+        //println!("{}", line);
+        let mut opened: Vec<usize> = Vec::new();
+        for c in line.chars() {
+            let i = num(c);
+            if i < 4 { // Open.
+                opened.push(i);
+            }
+            else { // Close.
+                let last_opened = opened.pop().unwrap_or(usize::MAX);
+                if i-4 == last_opened { // Valid
+                }
+                else { // Invalid.
+                    score += SCORES[i-4];
+                    //println!("Illegal {}.", c);
+                    break;
+                }                
+            }
+        }
+    }
+
+    println!("Total score: {}", score);
+}