3 files changed, 134 insertions, 0 deletions
diff --git a/23/input.txt b/23/input.txt
new file mode 100644
index 0000000..a2b735a
--- /dev/null
+++ b/23/input.txt
@@ -0,0 +1,47 @@
+jio a, +18
+inc a
+tpl a
+inc a
+tpl a
+tpl a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+tpl a
+inc a
+jmp +22
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+jio a, +8
+inc b
+jie a, +4
+tpl a
+inc a
+jmp +2
+hlf a
+jmp -7
diff --git a/23/main.py b/23/main.py
new file mode 100755
index 0000000..bf84465
--- /dev/null
+++ b/23/main.py
@@ -0,0 +1,65 @@
+#!/usr/bin/python
+
+
+
+def solve_partn(partn, program):
+    if partn == 1:
+        regs = { "a" : 0, "b" : 0 }
+    else: # partn == 2
+        regs = { "a" : 1, "b" : 0 }
+
+    # "Parse" the input once up front, so we don't waste time
+    # doing this each iteration of a loop in the given program.
+    tokens = []
+    for line in program:
+        words = line.split()
+        words[1] = words[1].rstrip(",")
+        tokens.append(words)
+
+    # Main program execution loop
+    i = 0 # instruction pointer
+    while i < len(tokens):
+        op = tokens[i][0]
+        d1 = tokens[i][1]
+
+        # The "i += 1" is repeated for consistency and clarity
+        if op == "hlf":
+            regs[d1] = int(regs[d1] / 2)
+            i += 1
+        elif op == "tpl":
+            regs[d1] = regs[d1] * 3
+            i += 1
+        elif op == "inc":
+            regs[d1] = regs[d1] + 1
+            i += 1
+        elif op == "jmp":
+            i += int(d1)
+        elif op == "jie":
+            if regs[d1] % 2 == 0:
+                d2 = tokens[i][2]
+                i += int(d2)
+            else:
+                i += 1
+        elif op == "jio":
+            if regs[d1] == 1:
+                d2 = tokens[i][2]
+                i += int(d2)
+            else:
+                i += 1
+
+    return regs["b"]
+
+
+
+def main():
+    # Read program's assembly code from input text file
+    with open("input.txt", "r") as f:
+        lines = f.read().splitlines()
+
+    print("Part 1 solution:", solve_partn(1, lines)) # 307 for me
+    print("Part 2 solution:", solve_partn(2, lines)) # 160 for me
+
+
+
+if __name__ == "__main__":
+    main()
diff --git a/23/test.py b/23/test.py
new file mode 100755
index 0000000..19dad35
--- /dev/null
+++ b/23/test.py
@@ -0,0 +1,22 @@
+#!/usr/bin/python
+
+import unittest
+
+import main
+
+
+
+class ExamplesPart1(unittest.TestCase):
+    def test_example1(self):
+        prog = [
+            "inc b",
+            "jio b, +2",
+            "tpl b",
+            "inc b"
+        ]
+        self.assertEqual(main.solve_partn(1, prog), 2)
+
+
+
+if __name__ == "__main__":
+    unittest.main()