feat(users/Profpatsch): add advent of code 2020 day 1 2 3 r/2245

Change-Id: I99d2882ac9ef5ede85032132f6727e7bad8f24eb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2564
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>

1 files changed, 77 insertions, 0 deletions

diff --git a/users/Profpatsch/advent-of-code/2020/02/main.py b/users/Profpatsch/advent-of-code/2020/02/main.py
new file mode 100644
index 000000000000..e3b27c382a21
--- /dev/null
+++ b/users/Profpatsch/advent-of-code/2020/02/main.py
@@ -0,0 +1,77 @@
+import sys
+
+def parse(line):
+    a = line.split(sep=" ", maxsplit=1)
+    assert len(a) == 2
+    fromto = a[0].split(sep="-")
+    assert len(fromto) == 2
+    (from_, to) = (int(fromto[0]), int(fromto[1]))
+    charpass = a[1].split(sep=": ")
+    assert len(charpass) == 2
+    char = charpass[0]
+    assert len(char) == 1
+    pass_ = charpass[1]
+    assert pass_.endswith("\n")
+    pass_ = pass_[:-1]
+    return {
+        "from": from_,
+        "to": to,
+        "char": char,
+        "pass": pass_
+    }
+
+def char_in_pass(char, pass_):
+    return pass_.count(char)
+
+def validate_01(entry):
+    no = char_in_pass(entry["char"], entry["pass"])
+    if no < entry["from"]:
+        return { "too-small": entry }
+    elif no > entry["to"]:
+        return { "too-big": entry }
+    else:
+        return { "ok": entry }
+
+def char_at_pos(char, pos, pass_):
+    assert pos <= len(pass_)
+    return pass_[pos-1] == char
+
+def validate_02(entry):
+    one = char_at_pos(entry["char"], entry["from"], entry["pass"])
+    two = char_at_pos(entry["char"], entry["to"], entry["pass"])
+    if one and two:
+        return { "both": entry }
+    elif one:
+        return { "one": entry }
+    elif two:
+        return { "two": entry }
+    else:
+        return { "none": entry }
+
+
+res01 = []
+res02 = []
+with open("./input", 'r') as f:
+    for line in f:
+        p = parse(line)
+        res01.append(validate_01(p))
+        res02.append(validate_02(p))
+
+count01=0
+for r in res01:
+    print(r)
+    if r.get("ok", False):
+        count01=count01+1
+
+count02=0
+for r in res02:
+    print(r)
+    if r.get("one", False):
+        count02=count02+1
+    elif r.get("two", False):
+        count02=count02+1
+    else:
+        pass
+
+print("count 1: {}".format(count01))
+print("count 2: {}".format(count02))