Add advent code for 2020 days 1-4

day_4/info.md

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+https://adventofcode.com/2020/day/4
+
+
+Part 1 Wrong Answers:
+ - `260` (too low)
+
+Part 2 Wrong Answers:
+ - `225` (too high)

day_4/part_1.py

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+with open("input") as f:
+	data = [x.replace("\n", " ") for x in f.read().split("\n\n")]
+
+# The fields that passports have, if True, it's required, if False, it's an
+# optional field
+fields = {
+	"byr": True,
+	"iyr": True,
+	"eyr": True,
+	"hgt": True,
+	"hcl": True,
+	"ecl": True,
+	"pid": True,
+	"cid": False
+}
+
+valid_passports = len(data)
+
+for passport in data:
+	for field, required in fields.items():
+		if field not in passport and required:
+			valid_passports -= 1
+			break
+
+print(f"Valid Passports: {valid_passports}")

day_4/part_2.py

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+import re
+
+with open("input") as f:
+	data = [x.replace("\n", " ") for x in f.read().split("\n\n")]
+
+# The fields that passports have
+fields = [
+	"byr",
+	"iyr",
+	"eyr",
+	"hgt",
+	"hcl",
+	"ecl",
+	"pid"
+]
+
+def year_validate(min, provided, max):
+	return int(min) <= int(provided) <= int(max)
+
+def size_validate(height):
+	if height.endswith("cm"):
+		return 150 <= int(height[:-2]) <= 193
+	elif height.endswith("in"):
+		return 59 <= int(height[:-2]) <= 76
+	return False
+
+def hair_validate(colour):
+	return re.match(r"#[\w]{6}", str(colour)) != None
+
+def eye_validate(colour):
+	return colour in ("amb", "blu", "brn", "gry", "grn", "hzl", "oth")
+
+def pid_validate(id):
+	return re.match(r"^[0-9]{9}$", str(id)) != None
+
+valid_passports = 0
+
+# Check all the passports for valid data
+for passport in data:
+	valid = True
+
+	# Check each required field
+	for field in fields:
+
+		# Ensure passport has field
+		if (i := passport.find(field)) != -1:
+			value = passport[i:].split(" ")[0].split(":")[1]
+
+			if field == "byr":
+				if not year_validate(1920, value, 2002):
+					valid = False
+					break
+			elif field == "iyr":
+				if not year_validate(2010, value, 2020):
+					valid = False
+					break
+			elif field == "eyr":
+				if not year_validate(2020, value, 2030):
+					valid = False
+					break
+			elif field == "hgt":
+				if not size_validate(value):
+					valid = False
+					break
+			elif field == "hcl":
+				if not hair_validate(value):
+					valid = False
+					break
+			elif field == "ecl":
+				if not eye_validate(value):
+					valid = False
+					break
+			elif field == "pid":
+				if not pid_validate(value):
+					valid = False
+					break
+		else:
+			valid = False
+
+	if valid:
+		valid_passports += 1
+
+
+print(f"Valid Passports: {valid_passports}")