AoC 2021: day2 input and solution

2021/solutions/day_02.py

@@ -0,0 +1,83 @@
+"""AOC Day 2"""
+
+from os import read
+import pathlib
+import time
+
+TEST_INPUT = """forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2"""
+
+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"""
+    entries = list()
+    for entry in input_data.split('\n'):
+        dir, dist = entry.split(' ')
+        dist = int(dist)
+        entries.append((dir, dist))
+    return entries
+
+def part1(entries: list) -> int:
+    """part1 solver take the entries and return the part1 solution"""
+    h_pos = 0
+    v_pos = 0
+    for dir, dist in entries:
+        if dir == "forward":
+            h_pos += dist
+        elif dir == "up":
+            v_pos -= dist
+        elif dir == "down":
+            v_pos += dist
+        else:
+            return None
+    return h_pos*v_pos
+
+def part2(entries: list) -> int:
+    """part2 solver take the entries and return the part2 solution"""
+    h_pos = 0
+    v_pos = 0
+    aim = 0
+    for dir, dist in entries:
+        if dir == "forward":
+            h_pos += dist
+            v_pos += aim * dist
+        elif dir == "up":
+            aim -= dist
+        elif dir == "down":
+            aim += dist
+        else:
+            return None
+    return h_pos*v_pos
+
+def test_input_day_02():
+    """pytest testing function"""
+    entries = extract(TEST_INPUT)
+    assert part1(entries) == 150
+    assert part2(entries) == 900
+
+def test_bench_day_02(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()