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This repository was archived by the owner on Sep 20, 2025. It is now read-only.

Commit a8dafa4

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Day 21 Python solutions
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‎21-1.py‎

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#!/usr/bin/env python
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import re
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monkeys = {}
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class Monkey:
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def __init__(self, name, operation):
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number_format = re.compile("^(?P<num>[0-9]+)$")
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calc_format = re.compile("^(?P<m1>[a-z]+) (?P<op>[-+*/]) (?P<m2>[a-z]+)$")
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self.operation = operation
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self.name = name
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self.val = None
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if (m := number_format.match(self.operation)):
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self.val = int(m["num"])
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else:
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m = calc_format.match(self.operation)
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self.m1 = m["m1"]
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self.op = m["op"]
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self.m2 = m["m2"]
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def value(self):
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if self.val is not None:
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return self.val
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if self.op == "+":
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self.val = monkeys[self.m1].value() + monkeys[self.m2].value()
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elif self.op == "-":
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self.val = monkeys[self.m1].value() - monkeys[self.m2].value()
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elif self.op == "*":
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self.val = monkeys[self.m1].value() * monkeys[self.m2].value()
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elif self.op == "/":
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self.val = monkeys[self.m1].value() // monkeys[self.m2].value()
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return self.val
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def __str__(self):
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return f"<{self.__class__.__name__}: {self.name} = {self.operation} ({self.val})>"
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monkey_format = re.compile("^(?P<name>[a-z]+): (?P<op>.*)$")
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lines = [row.strip() for row in open("21.input").readlines()]
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for line in lines:
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m = monkey_format.match(line)
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monkeys[m["name"]] = Monkey(m["name"], m["op"])
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print(monkeys["root"].value())

‎21-2.py‎

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#!/usr/bin/env python
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import re
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monkeys = {}
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class IsHuman(RuntimeError):
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pass
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class Monkey:
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setting = False
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def __init__(self, name, operation):
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number_format = re.compile("^(?P<num>[0-9]+)$")
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calc_format = re.compile("^(?P<m1>[a-z]+) (?P<op>[-+*/]) (?P<m2>[a-z]+)$")
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self.operation = operation
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self.name = name
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self.val = None
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if (m := number_format.match(self.operation)):
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self.val = int(m["num"])
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else:
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m = calc_format.match(self.operation)
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self.m1 = m["m1"]
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self.op = m["op"]
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if self.name == "root":
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self.op = "=="
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self.m2 = m["m2"]
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def value(self):
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if self.setting and self.name == "humn":
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raise IsHuman
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if self.val is not None:
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return self.val
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if self.op == "+":
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self.val = monkeys[self.m1].value() + monkeys[self.m2].value()
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elif self.op == "-":
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self.val = monkeys[self.m1].value() - monkeys[self.m2].value()
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elif self.op == "*":
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self.val = monkeys[self.m1].value() * monkeys[self.m2].value()
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elif self.op == "/":
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self.val = monkeys[self.m1].value() // monkeys[self.m2].value()
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return self.val
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def set_equal(self, value):
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if self.name == "humn":
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self.val = value
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return
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try:
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left = monkeys[self.m1].value()
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except IsHuman:
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left = None
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try:
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right = monkeys[self.m2].value()
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except IsHuman:
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right = None
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if self.op == "==":
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if right is not None:
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monkeys[self.m1].set_equal(right)
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if left is not None:
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monkeys[self.m2].set_equal(left)
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elif self.op == "+":
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if right is not None:
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monkeys[self.m1].set_equal(value - right)
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if left is not None:
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monkeys[self.m2].set_equal(value - left)
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elif self.op == "-":
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if right is not None:
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monkeys[self.m1].set_equal(value + right)
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if left is not None:
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monkeys[self.m2].set_equal(left - value)
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elif self.op == "*":
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if right is not None:
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monkeys[self.m1].set_equal(value // right)
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if left is not None:
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monkeys[self.m2].set_equal(value // left)
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elif self.op == "/":
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if right is not None:
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monkeys[self.m1].set_equal(value * right)
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if left is not None:
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monkeys[self.m2].set_equal(left // value)
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def __str__(self):
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return f"<{self.__class__.__name__}: {self.name} = {self.operation} ({self.val})>"
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monkey_format = re.compile("^(?P<name>[a-z]+): (?P<op>.*)$")
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lines = [row.strip() for row in open("21.input").readlines()]
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for line in lines:
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m = monkey_format.match(line)
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monkeys[m["name"]] = Monkey(m["name"], m["op"])
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Monkey.setting = True
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monkeys["root"].set_equal(None)
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Monkey.setting = False
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print(monkeys["humn"].value())

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