AoC 2021: day 10 solutions

2021/solutions/day_10.py

@@ -0,0 +1,91 @@
+"""AOC Day 10"""
+
+import pathlib
+import time
+from collections import deque
+
+TEST_INPUT = """[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]"""
+
+ILLEGAL_SCORE = {')': 3, ']': 57, '}': 1197, '>': 25137}
+MISSING_SCORE = {')': 1, ']': 2, '}': 3, '>': 4}
+
+def read_input(input_path: str) -> str:
+    """take input file path and return a str with the file's content"""
+    with open(input_path, 'r') as input_file:
+        input_data = input_file.read().strip()
+        return input_data
+
+def extract(input_data: str) -> list:
+    """take input data and return the appropriate data structure"""
+    lines = input_data.split('\n')
+    scores = list()
+    for line in lines:
+        stack = deque()
+        for p in line:
+            if p == '(':
+                stack.append(')')
+            elif p == '[':
+                stack.append(']')
+            elif p == '{':
+                stack.append('}')
+            elif p == '<':
+                stack.append('>')
+            elif stack.pop() != p:
+                scores.append((ILLEGAL_SCORE[p], 0))
+                break
+        else:
+            missing_score = 0
+            while stack:
+                missing_score *= 5
+                missing_score += MISSING_SCORE[stack.pop()]
+            scores.append((0, missing_score))
+    return scores
+
+def part1(scores: list) -> int:
+    """part1 solver take the entries and return the part1 solution"""
+    syntax_error_score = 0
+    for score in scores:
+        syntax_error_score += score[0]
+    return syntax_error_score
+
+def part2(scores: list) -> int:
+    """part2 solver take the entries and return the part2 solution"""
+    missing_score = list()
+    for score in scores:
+        if score[1] > 0:
+            missing_score.append(score[1])
+    missing_score.sort()
+    return missing_score[len(missing_score) // 2]
+
+def test_input_day_10():
+    """pytest testing function"""
+    entries = extract(TEST_INPUT)
+    assert part1(entries) == 26397
+    assert part2(entries) == 288957
+
+def test_bench_day_10(benchmark):
+    """pytest-benchmark function"""
+    benchmark(main)
+
+def main():
+    """main function"""
+    input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem)
+    start_time = time.time()
+    input_data = read_input(input_path)
+    entries = extract(input_data)
+    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()