1 files changed, 61 insertions, 0 deletions
diff --git a/07/main.py b/07/main.py
new file mode 100755
index 0000000..7babff9
--- /dev/null
+++ b/07/main.py
@@ -0,0 +1,61 @@
+#!/usr/bin/python
+
+
+
+def eval_wire(wires, w):
+    # Shortcut for cleaner code
+    if w.isdigit():
+        return int(w) & 65535
+
+    result = 0
+    tokens = wires[w]
+
+    if len(tokens) == 1:
+        result = eval_wire(wires, tokens[0])
+
+    if len(tokens) == 2:
+        if tokens[0] == "NOT":
+            result = ~eval_wire(wires, tokens[1])
+
+    if len(tokens) == 3:
+        if tokens[1] == "AND":
+            result = eval_wire(wires, tokens[0]) & eval_wire(wires, tokens[2])
+        if tokens[1] == "OR":
+            result = eval_wire(wires, tokens[0]) | eval_wire(wires, tokens[2])
+        if tokens[1] == "LSHIFT":
+            result = eval_wire(wires, tokens[0]) << eval_wire(wires, tokens[2])
+        if tokens[1] == "RSHIFT":
+            result = eval_wire(wires, tokens[0]) >> eval_wire(wires, tokens[2])
+
+    result &= 65535
+    wires[w] = [str(result)] # cache result
+    return int(result)
+
+
+
+def solve_partn(partn, lines):
+    # Parse input into a marginally nicer form
+    wires = {}
+    for line in lines:
+        words = line.split(" ")
+        wires[words[-1]] = words[0 : -2]
+
+    if partn == 2:
+        wires["b"] = ["46065"]
+
+    return eval_wire(wires, "a")
+
+
+
+def main():
+    # Read wire configuration from input text file
+    with open("input.txt", "r") as f:
+        lines = f.read().splitlines()
+
+    print("Part 1 solution:", solve_partn(1, lines)) # 46065 for me
+    print("Part 2 solution:", solve_partn(2, lines)) # 14134 for me
+
+
+
+if __name__ == "__main__":
+    main()