Solve 2020 day 4

2020/d4.py

@@ -0,0 +1,106 @@
+from lib import get_data, Grid2D
+
+required = [         
+    "byr",
+    "iyr",
+    "eyr",
+    "hgt",
+    "hcl",
+    "ecl",
+    "pid",]
+
+
+# hgt (Height) - a number followed by either cm or in:
+# 
+#     If cm, the number must be at least 150 and at most 193.
+#     If in, the number must be at least 59 and at most 76.
+
+
+def part_1(data):
+    passwords = [""]
+    for line in data.splitlines():
+        if line.strip() == "":
+            passwords.append("")
+        else:
+            passwords[-1] = passwords[-1] + " " + line.strip()
+
+    valid = 0
+    for pw in passwords:
+        for r in required:
+            if r not in pw:
+                break
+        else:
+            valid += 1
+    print(valid)
+
+    kws = []
+    for pw in passwords:
+        d = {}
+        for word in pw.split():
+            key, value = word.split(":")
+            d[key] = value
+        kws.append(d)
+
+    valid = 0
+    for kw in kws:
+        for r in required:
+            if r not in kw:
+                break
+            match r:
+                case "hgt":
+                    v = int(kw[r][:-2])
+                    if kw[r].endswith("cm"):
+                        if v < 150 or v > 193:
+                            break
+                    elif kw[r].endswith("in"):
+                        if v < 59 or v > 76:
+                            break
+                    else:
+                        break
+                case "byr":
+                    v = int(kw[r])
+                    if v < 1920 or v > 2002:
+                        break
+                case "iyr":
+                    v = int(kw[r])
+                    if v < 2010 or v > 2020:
+                        break
+                case "eyr":
+                    v = int(kw[r])
+                    if v < 2020 or v > 2030:
+                        break
+                case "hcl":
+                    v = kw[r]
+                    if len(v) != 7 or not v.startswith("#"):
+                        break
+                    try:
+                        int(v.replace("#", ""), 16)
+                    except ValueError:
+                        break
+                case "pid":
+                    v = kw[r]
+                    if len(v) != 9:
+                        break
+                    try:
+                        int(v, 10)
+                    except ValueError:
+                        break
+                case "ecl":
+                    v = kw[r]
+                    if not v in ["amb", "blu", "brn", "gry", "grn", "hzl", "oth"]:
+                        break
+                case _:
+                    assert False
+
+        else:
+            valid += 1
+    print(valid)
+
+
+def main():
+    data = get_data(__file__)
+    part_1(data)
+
+
+if __name__ == "__main__":
+    main()

README.md

@@ -136,7 +136,8 @@ Solutions and utility script for Advent of Code challenges in Python.
 - Day 1: 2:48  (people weren't able to submit because of a website outage)
 - Day 2: 4:47  (no leaderboard, you can tell it's getting faster)
 - Day 3: 7:06  (way too slow, lol; time to take it seriously)
-- Day 4: 
+- Day 4: 14:30 (yo, I am just too slow)
+- Day 5:
 
 
 ## AoC 2022