chore: create new project structure and aoc.py runner script

adventofcode/2023/day9/day9.py

@@ -0,0 +1,33 @@
+def parse_input(infile):
+    with open(infile) as f:
+        return [[int(x) for x in l.strip().split()] for l in f.readlines()]
+
+
+def process_line(line):
+        if set(line) == {0}:
+            return 0
+        else:
+            next_line = [cur - next for next, cur in zip(line, line[1:])]
+            return line[-1] + process_line(next_line)
+
+
+def process_line_back(line):
+    if set(line) == {0}:
+        return 0
+    else:
+        next_line = [cur - next for next, cur in zip(line, line[1:])]
+        return line[0] - process_line_back(next_line)
+
+
+def solve(data):
+    print(f"Part 1: {sum(process_line(l) for l in data)}")
+    print(f"Part 2: {sum(process_line_back(l) for l in data)}")
+
+
+if __name__ == "__main__":
+    import sys
+    import os
+    SCRIPTPATH = os.path.dirname(os.path.realpath(__file__))
+    infile = sys.argv[1] if len(sys.argv) == 2 else "example.txt"
+    data = parse_input(os.path.join(SCRIPTPATH, infile))
+    solve(data)