Day 21 part 2

2019/day21-p1.springscript

@@ -1,6 +1,9 @@
+# In any case, jump only if 4th tile is ground as it's where we land.
 OR D J
+# If 3rd is a hole, jump.
 NOT C T
 AND T J
+# If the next tile is a hole, you must jump anyway.
 NOT A T
 OR T J
 WALK

2019/day21-p2.springscript

@@ -0,0 +1,16 @@
+# Jump if 1 is a hole.
+NOT A J
+# Jump if there are holes that can be directly jumped.
+NOT B T
+OR T J
+NOT C T
+OR T J
+# Don't jump if 4 is a hole.
+AND D J
+# Don't jump if 5 and 8 are holes.
+NOT E T
+NOT T T
+OR H T
+AND T J
+# Go!
+RUN

2019/day21.py

@@ -1,3 +1,5 @@
+"""Pipe springscript file to stdin. Comments (#) can be escaped with grep -v."""
+
 import sys
 
 from intcode import AIC