Complete day 18

18.input

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+3 * 8 + (8 + 5) * (7 + 5 + 6)
+5 + (5 + (7 + 5)) * 8 * 6 * ((9 + 3 * 2 * 5 + 2 + 9) * 2 + 5 + 3 * 6) * ((2 + 2 * 9) * 6 * 8 * 7 * (4 * 5) * 6)
+7 + 3 * 6 + ((5 + 2 + 6 + 5 + 5 * 4) * 4 * 9)
+5 * 4 + 8 * 3
+(8 + 6 * 6 + 5) + 9 + (6 + 3) + 7 + 6

18.py

@@ -0,0 +1,82 @@
+lines = []
+
+with open("18.input") as f:
+    for line in f.readlines():
+        lines.append(line.strip())
+
+def parse(line):
+    res = []
+
+    i = 0
+    while i < len(line):
+        c = line[i]
+        i += 1
+        if c in "0123456789+*":
+            res.append(c)
+        elif c == '(':
+            buf = []
+            depth = 1
+            while True:
+                c = line[i]
+                i += 1
+                if c == '(':
+                    depth += 1
+                elif c == ')':
+                    depth -= 1
+                if depth == 0:
+                    break
+                buf.append(c)
+            res.append(parse(buf))
+    return res
+
+
+def task_1(expression):
+    res = int(expression[0])
+    i = 1
+    while i < len(expression):
+        op = expression[i]
+        i += 1
+        val = int(expression[i])
+        i += 1
+        if op == '*':
+            res *= val
+        elif op == '+':
+            res += val
+    return res
+
+
+def task_2(expression):
+    # evaluate additions
+    i = 0
+    while i < len(expression):
+        if expression[i] == '+':
+            expression[i - 1] = int(expression[i - 1]) + int(expression[i + 1])
+            del expression[i:i+2]
+            i = i - 1
+        i += 1
+    # evaluate multiplications
+    i = 0
+    while i < len(expression):
+        if expression[i] == '*':
+            expression[i - 1] = int(expression[i - 1]) * int(expression[i + 1])
+            del expression[i:i+2]
+            i = i - 1
+        i += 1
+    assert len(expression) == 1
+    return expression[0]
+
+
+def evaluate(expression, presedence_function):
+    if len(expression) == 1:
+        try:
+            return int(expression[0])
+        except ValueError:
+            return evaluate(expression[0], presedence_function)
+    else:
+        expression = [e if type(e) is not list else evaluate(e, presedence_function) for e in expression]
+        # now we no parentheses left :-)
+        return presedence_function(expression)
+
+
+print("Answer 1:", sum([evaluate(parse(line), task_1) for line in lines]))
+print("Answer 2:", sum([evaluate(parse(line), task_2) for line in lines]))

18.small.input

@@ -0,0 +1 @@
+5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))