diff --git a/day18/sol.py b/day18/sol.py
index be965eb..8af864a 100644
--- a/day18/sol.py
+++ b/day18/sol.py
@@ -10,22 +10,24 @@ def parse(file):
 def solve(file, N=71, T=1024):
     falling = parse(file)
     inf = float('inf')
-    map = [[0]*N for _ in range(N)]
-    map = defaultdict(lambda: inf)
+    map = defaultdict(lambda: 1)
     for i,p in enumerate(falling):
-        map[p] = i
-    sol = _solve(map, N, T)
+        if i > T:
+            break
+        map[p] = 0
+    sol = _solve(map, N)
     print(sol)
     print(len(sol[-1])-1)
 
-def _solve(map, N=71, T=1024):
-    start = (0,0) # x,y,t
+def _solve(map, N):
+    start = (0,0) # x,y
+    end = N-1, N-1
     
     def neighbors(n):
         x,y = n
         def push(x,y):
             if 0 <= x < N and 0 <= y < N:
-                if T <= map[x,y]:
+                if map[x,y]:
                     out.append((1,(x,y)))
         out = []
         push(x+1,y)
@@ -34,27 +36,24 @@ def _solve(map, N=71, T=1024):
         push(x,y-1)
         return out
 
-    end = N-1, N-1
-
     def heuristic(n):
         return abs(end[0] - n[0]) + abs(end[1] - n[1])
 
     return astar.search(start, end, neighbors, heuristic)
 
 import math
-def solve2(file, N=71, T=1024):
+def solve2(file, N):
     falling = parse(file)
-    inf = float('inf')
-    map = [[0]*N for _ in range(N)]
-    map = defaultdict(lambda: inf)
+    map = defaultdict(lambda: 1)
     for i,p in enumerate(falling):
-        map[p] = i
-        sol = _solve(map, N, i+1)
+        map[p] = 0
+        sol = _solve(map, N)
         if math.isinf(sol[0]):
             print(p)
             break
 
 solve(open("sample1.in"), N=7, T=12)
-solve2(open("sample1.in"), N=7, T=12)
+solve2(open("sample1.in"), N=7)
+print()
 solve(open("input"), N=71, T=1024)
-solve2(open("input"), N=71, T=1024)
+solve2(open("input"), N=71)