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

adventofcode/2018/day5/day5.py

@@ -0,0 +1,25 @@
+def reduce_polymer(p):
+    res = [""]
+    for x in p:
+        if res[-1].swapcase() == x:
+            res.pop()
+        else:
+            res.append(x)
+    return "".join(res)
+
+
+def main(inp):
+    print("Part 1: ", len(reduce_polymer(inp)))
+    letters = set(x.lower() for x in inp)
+    min_ = 2 << 32
+    for l in letters:
+        p = inp.replace(l.lower(), "").replace(l.upper(), "")
+        min_ = min(len(reduce_polymer(p)), min_)
+    print("Part 2: ", min_)
+
+
+if __name__ == "__main__":
+    import fileinput
+    inp = next(l.rstrip() for l in fileinput.input())
+    main(inp)
+