1 files changed, 49 insertions, 0 deletions
diff --git a/day7.k b/day7.k
new file mode 100644
index 0000000..69411c6
--- /dev/null
+++ b/day7.k
@@ -0,0 +1,49 @@
+d:0:"day7";
+
+ss:{1 _' (&y=y,x) _ y,x}; / split x at y
+l:ss[;" "]' d;
+
+/ 16-bit "arithmetics"
+bits16:{-16#(16#0), 2 _vs x};
+lshift:{-16#x,y#0};
+rshift:{16#(y#0),x};
+
+dp:[];
+cl:[];
+dep:{
+  :[ "NOT"~x[0]; (dp[`$x[3]]: ,`$x[1]; cl[`$x[3]]: x)
+     "AND"~x[1]; (dp[`$x[4]]: `$x[0 2]; cl[`$x[4]]: x)
+     "OR"~x[1]; (dp[`$x[4]]: `$x[0 2]; cl[`$x[4]]: x)
+     "LSHIFT"~x[1]; (dp[`$x[4]]: ,`$x[0]; cl[`$x[4]]: x)
+     "RSHIFT"~x[1]; (dp[`$x[4]]: ,`$x[0]; cl[`$x[4]]: x)
+     1; (dp[`$x[2]]: 0#`; cl[`$x[2]]: x)
+  ]
+};
+
+dep' l; / trace dependencies
+{dp[x]:0#`}'(,/dp[!dp]) _dvl !dp; / completion
+/ now sort topologically
+order:{[s]?|,/{?,/s@x}\!s}; / variant of nsl order.k
+o: (order dp) _dvl `a `"1"; / drop 1 and a, instead use lx
+
+v:[]; / variables
+v[`"1"]: bits16 1; / constant 1
+
+/ interpreter
+op:{
+  :["NOT"~x[0]; v[`$x[3]]: ~v[`$x[1]]
+    "AND"~x[1]; v[`$x[4]]: v[`$x[0]]&v[`$x[2]]
+    "OR"~x[1]; v[`$x[4]]: v[`$x[0]]|v[`$x[2]]
+    "LSHIFT"~x[1]; v[`$x[4]]: lshift[v[`$x[0]];0$x[2]]
+    "RSHIFT"~x[1]; v[`$x[4]]: rshift[v[`$x[0]];0$x[2]]
+    1; v[`$x[2]]: bits16 0$x[0]]
+};
+
+op' cl[o];
+a: 2 _sv v[`lx]
+
+/ part 2
+
+cl[`b]: ($a;"->";"b");
+op' cl[o];
+a: 2 _sv v[`lx]