AoC 2020: day2

Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>

2020/solutions/day_2.py

@@ -0,0 +1,49 @@
+"""AOC Day 1"""
+
+import pathlib
+import time
+import re
+
+def read_input(input_path: str) -> list:
+    """take input file path and return appropriate data structure"""
+    with open(input_path, 'r') as input_file:
+        rules = list()
+        for entry in input_file.readlines():
+            splitted = re.split('-| |: ', entry)
+            rule = [int(splitted[0]), int(splitted[1]), splitted[2], splitted[3]]
+            rules.append(rule)
+        return rules
+
+
+def part1(entries: list) -> int:
+    """part1 solver take a list of tuples and return an int"""
+    correct_passwords = 0
+    for entry in entries:
+        occurrences = entry[3].count(entry[2])
+        if occurrences in range(entry[0], entry[1]+1):
+            correct_passwords += 1
+    return correct_passwords
+
+
+def part2(entries: list) -> int:
+    """part2 solver take a list of tuples and return an int"""
+    correct_passwords = 0
+    for entry in entries:
+        pos_1, pos_2, letter, password = entry[:]
+        if (password[pos_1-1] == letter) != (password[pos_2-1] == letter):
+            correct_passwords += 1
+    return correct_passwords
+
+def main():
+    """main function"""
+    input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem)
+    entries = read_input(input_path)
+    start_time = time.time()
+    print("Part 1: %d" % part1(entries))
+    print("Part 2: %d" % part2(entries))
+    end_time = time.time()
+    print("Execution time: %f" % (end_time-start_time))
+
+
+if __name__ == "__main__":
+    main()