1 files changed, 35 insertions, 0 deletions
diff --git a/2021/10/code.tl b/2021/10/code.tl
new file mode 100644
index 0000000..4e020cb
--- /dev/null
+++ b/2021/10/code.tl
@@ -0,0 +1,35 @@
+(defun corrupt (str)
+  (if-match (@pos . @len) (search-str-tree str '("(]" "(}" "(>"
+                                                 "[)" "[}" "[>"
+                                                 "{)" "{]" "{>"
+                                                 "<)" "<]" "<}"))
+    pos))
+
+(defun reduxe (str)
+  (while-match (@pos . @len) (search-str-tree str '("()" "[]" "{}" "<>"))
+    (del [str pos..(ssucc pos)]))
+  str)
+
+(defun solve-part-one (: (name "input"))
+  (with-stream (s (open-file name))
+    (let ((score 0))
+      (whilet ((line (get-line s)))
+        (let ((rline (reduxe line)))
+          (iflet ((pos (corrupt rline)))
+            (inc score
+                 (ecaseq [rline (succ pos)]
+                   (#\) 3)
+                   (#\] 57)
+                   (#\} 1197)
+                   (#\> 25137))))))
+      score)))
+
+(defun solve-part-two (: (name "input"))
+  (flow
+    (file-get-lines name)
+    (mapcar reduxe)
+    (remove-if [orf corrupt empty])
+    (mapcar (opip (mapcar (relate "([{<" #(1 2 3 4)))
+                  (rpoly 5)))
+    (sort)
+    [callf ref use [chain len (lop trunc 2)]]))