chore

Author: spaenleh

Sources/Day17.swift

@@ -104,6 +104,26 @@ struct Day17: AdventDay {
   }
 
   func part2() -> Int {
+    // 2,4 -> assign to B modulo 8
+    // 1,7 -> xor B with 7 -> inverts bits in B
+    // 7,5 -> div register A with content of 2 pow B and put in C
+    // 1,7 -> again
+    // 4,6 -> B = B xor C
+    // 0, 3 -> register A = A div (2 pow 3)
+    // 5,5 -> out reg B
+    // 3,0 -> start over if A is not 0
+    //
+
+    // B needs to be 2
+    // 000 -> 010 (2)
+    // we start with B = 4 -> 100
+    // invert bits on B -> 011
+    // C needs to be result in X % 8 = 5
+    // a / 2^4
+    // requirements
+    // A needs to be 14 digits
+    // 266 gives the first right digit
+
     0
   }
 }

Tests/Day17.swift

@@ -63,9 +63,20 @@ struct Day17Tests {
     #expect(challenge.part1() == "4,6,3,5,6,3,5,2,1,0")
   }
 
-  @Test("part2")
+  @Test(.disabled("part2"))
   func testPart2() async throws {
-    let challenge = Day17(data: testData)
-    #expect(challenge.part2() == 0)
+    // 66245665785645
+    let challenge = Day17(
+      data: """
+        Register A: 35048
+        Register B: 0
+        Register C: 0
+
+        Program: 2,4,1,7,7,5,1,7,4,6,0,3,5,5,3,0
+        """)
+    let res = challenge.part1()
+    let expectedRes = "2,4,1,7,7,5,1,7,4,6,0,3,5,5,3,0"
+    #expect(res.count == expectedRes.count)
+    #expect(res == expectedRes)
   }
 }