solutions

solutions/1/main.py

@@ -0,0 +1,17 @@
+from typing import List
+from itertools import product
+from os.path import join, dirname
+
+target = 2020
+data = join(dirname(__file__), 'data.txt')
+with open(data) as f:
+    numbers: List[int] = list(map(int, f.readlines()))
+    for a, b in product(numbers, numbers):
+        if a + b == target:
+            print(f'The numbers: {a} and {b}.\tSolution: {a*b}')
+            break
+
+    for a, b, c in product(numbers, numbers, numbers):
+        if a + b + c == target:
+            print(f'The numbers: {a}, {b} and {c}.\tSolution: {a*b*c}')
+            break

solutions/2/main.py

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+from typing import List
+from os.path import join, dirname
+
+
+def checkRow(row: str, alternative=False) -> bool:
+    rule, password = map(lambda s: s.strip(), row.split(':'))
+    amount, char = rule.split(' ')
+    minimum, maximum = map(int, amount.split('-'))
+    if alternative:
+        return (password[minimum - 1] == char) ^ (password[maximum - 1] != char)
+    else:
+        occurrences = password.count(char)
+        return minimum <= occurrences <= maximum
+
+
+data = join(dirname(__file__), 'data.txt')
+with open(data) as f:
+    valid = 0
+    valid_alt = 0
+    rows = list(f.read().strip().split('\n'))
+    for row in rows:
+        if(checkRow(row)):
+            valid += 1
+        if(checkRow(row, alternative=True)):
+            valid_alt += 1
+    print(f'Found {valid} valid passwords.')
+    print('Policy changed...')
+    print(f'Found {valid_alt} valid passwords.')