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+(* Day 1: Part 1 *)
+
+let calculate_distance x y = Stdlib.abs (x - y)
+
+(** Require: left and right to be the same length *)
+let solve left right =
+  let sorted_left = List.sort Stdlib.compare left in
+  let sorted_right = List.sort Stdlib.compare right in
+  let distances = List.map2 calculate_distance sorted_left sorted_right in
+  List.fold_left ( + ) 0 distances
+
+let left line =
+  let pos = 0 in
+  let len = String.index line ' ' in
+  String.sub line pos len
+
+let right line =
+  let pos = String.rindex line ' ' + 1 in
+  let len = String.length line - pos in
+  String.sub line pos len
+
+let line_to_tuple line = (left line, right line)
+
+let lines_to_lists lines =
+  let tuples = List.map line_to_tuple lines in
+  let left =
+    List.map
+      (fun t ->
+        let l, _ = t in
+        int_of_string l)
+      tuples
+  in
+  let right =
+    List.map
+      (fun t ->
+        let _, r = t in
+        int_of_string r)
+      tuples
+  in
+  (left, right)