diff --git a/aoc2024-eutro.el b/aoc2024-eutro.el
index 038f15d..2a578d4 100644
--- a/aoc2024-eutro.el
+++ b/aoc2024-eutro.el
@@ -54,10 +54,16 @@ With PREFIX, read input from the buffer."
                 (expand-file-name "run.sh" aoc-root)
                 args))
          (win (selected-window)))
+    (set-process-sentinel
+     proc
+     (lambda (_proc msg)
+       (with-selected-window (get-buffer-window buf)
+         (recenter -1))))
     (unless (eq (window-buffer win) buf)
-      (pop-to-buffer buf 'display-buffer-use-least-recent-window))
-    (message "./run.sh %s" (string-join (mapcar #'shell-quote-argument args) " "))
-    (unless prefix (select-window win))))
+      (if prefix
+          (pop-to-buffer buf 'display-buffer-use-least-recent-window)
+        (display-buffer buf 'display-buffer-use-least-recent-window)))
+    (message "./run.sh %s" (string-join (mapcar #'shell-quote-argument args) " "))))
 
 (defun aoc-copy-part-answer (part)
   "Copy the answer for the given PART from *aoc-output*."
diff --git a/days/day02.st b/days/day02.st
index 914434d..f8b7541 100644
--- a/days/day02.st
+++ b/days/day02.st
@@ -1,26 +1,23 @@
 Collection extend [
     checkSafeStep: a to: b
-    [ |delta| (a < 1) | (b > self size) ifTrue: [^true].
-      delta := (self at: b) - (self at: a).
-      ^(1 <= delta) & (delta <= 3) ]
+    [ (a < 1) | (b > self size) ifTrue: [^true].
+      ^(self at: b) - (self at: a) between: 1 and: 3 ]
 
     safetyFwd
     [ | dp | dp := Array new: self size + 1.
       (self size to: 0 by: -1) do: [
-          :i | | v |
-          v := i + 1 to: self size + 1.
-          v := v select: [ :j | self checkSafeStep: i to: j ].
-          v := v collect: [ :j | (dp at: (j + 1) ifAbsent: [0]) + (j - i - 1) ].
-          v := v fold: [ :l :r | l min: r ].
-          dp at: (i + 1) put: v ].
+          :i | i chain + 1;
+             to: i + 2; "or `self size + 1`, but only jumps of 1 are possible"
+             select: [ :j | self checkSafeStep: i to: j ];
+             collect: [ :j | (dp at: (j + 1) ifAbsent: [0]) + (j - i - 1) ];
+             minimum; >* [ :v | dp at: (i + 1) put: v ] ].
       ^dp at: 1 ]
     safety [ ^self safetyFwd min: self reverse safetyFwd ]
 ]
 
-AOC input: [ stdin toLines collect:
-                 [ :ln | ((ln tokenize: ' ')
-                              collect: [ :lvl | lvl scanf: '%d' with: [:e|e] ])
-                             safety ] ];
+AOC input: [ stdin toLines collect: [
+               :ln | ln chain tokenize: ' ';
+                   collect: [ :lvl | lvl asNumber ]; safety ] ];
     part1: 0; part2: 1;
     result: [ :reports :damp | reports count: [ :it | it <= damp ] ];
     finish
diff --git a/days/utils.st b/days/utils.st
index 37a9741..31688e9 100644
--- a/days/utils.st
+++ b/days/utils.st
@@ -20,7 +20,12 @@ AOC class extend [
       self runPart: savedP2 part: 2 arg: inp. ]
 
     "TODO: save as an image?"
-    finish [ self run ]
+    finish
+    [ | startTime stopTime |
+      startTime := Time millisecondClock.
+      self run.
+      stopTime := Time millisecondClock.
+      stdout << 'Time elapsed: ' << (stopTime - startTime) << 'ms'; nl. ]
 ]
 
 "--- Scanf ---"
@@ -117,7 +122,10 @@ Object extend [
 ]
 
 Iterable extend [
-    sum [ ^self fold: [ :l :r | l + r ] ]
+    sum [ ^self inject: 0 into: [ :l :r | l + r ] ]
+    minimum [ ^self inject: FloatD infinity into: [ :l :r | l min: r ] ]
+    maximum [ ^self inject: FloatD negativeInfinity into: [ :l :r | l max: r ] ]
+
     toList [ ^self toCollection: OrderedCollection ]
     toBag [ ^self toCollection: Bag ]
     toSet [ ^self toCollection: Set ]
@@ -159,3 +167,14 @@ BlockClosure extend [
 Array extend [
     letArrayInBlock: block [ ^block valueWithArguments: self ]
 ]
+
+"Pipeline proxy class which forwards onto a boxed value"
+nil subclass: MessageChain [
+    | val |
+    pipelineValue: v [ val := v ]
+    yourself [ ^val ]
+    doesNotUnderstand: msg [ val := msg reinvokeFor: val. ^val ]
+    >* block [ ^block value: val ]
+    MessageChain class >> new [ ^self basicNew ]
+]
+Object extend [ chain [ ^MessageChain new pipelineValue: self ] ]
diff --git a/run.sh b/run.sh
index b0bfec4..c3dd0de 100755
--- a/run.sh
+++ b/run.sh
@@ -22,4 +22,4 @@ else
     fi
 fi
 
-exec gst "days/utils.st" "days/day$DAYP.st" < "$AOC_INPUT"
+exec gst -g "days/utils.st" "days/day$DAYP.st" < "$AOC_INPUT"