add solution to 18 from local

18/main.py

@@ -0,0 +1,22 @@
+def parse(s: str) -> list[list[int]]:
+    return [[int(i) for i in l.split()] 
+                for l in s.strip().splitlines()]
+
+def solve(l: list[list[int]]) -> int:
+    cache = {}
+    n = len(l)
+    l = reversed(l)
+    for i, row in enumerate(l):
+        for j, val in enumerate(row):
+            if i == 0:
+                cache.update({(i, j): val})
+            else:
+                l = cache[(i-1, j)]
+                r = cache[(i-1, j+1)]
+                cache.update({(i, j): val+max(l, r)})
+    return cache[(n-1, 0)]
+
+if __name__ == '__main__':
+    with open("input", "r") as f:
+        input = f.read()
+    print(solve(parse(input)))