Finish 2015.

2015/d23.py

@@ -0,0 +1,40 @@
+
+insts = []
+with open("i23.txt", "r") as f:
+    for line in f:
+        args = line.strip().replace(",", "").split()
+        insts.append(args)
+
+part_2 = True
+i = 0
+regs = {"a": 0, "b": 0}
+if part_2:
+    regs["a"] = 1
+
+while i < len(insts):
+    inst = insts[i]
+    match inst:
+        case ["inc", reg]:
+            regs[reg] += 1
+        case ["hlf", reg]:
+            regs[reg] //= 2
+        case ["tpl", reg]:
+            regs[reg] *= 3
+        case ["jio", reg, offset]:
+            if regs[reg] == 1:
+                i += int(offset)
+                continue
+        case ["jie", reg, offset]:
+            offset = int(offset)
+            if regs[reg] % 2 == 0:
+                i += int(offset)
+                continue
+        case ["jmp", offset]:
+            i += int(offset)
+            continue
+        case _:
+            print(inst)
+            assert False
+    i += 1
+
+print(regs["b"])