Finally finished, learned how not init nested array

15/main.py

@@ -4,29 +4,31 @@ import numpy as np
 
 
 # Given a grid with start in one corner and goal in opposite corner, find 
-# the number of paths you can take from start to goal
+# the number of paths you can take from start to goal. Do this for a grid
+# of 20 by 20
 
 
-gs = [[0] * 21] * 21
-
-def gridRoutes(x, y):
+def gridRoutes(x, y, gs):
     res = 0
 
     if gs[x][y] > 0:
         res = gs[x][y]
 
     else:
-        if x == 1:
-            res = y + 1
-        elif y == 1:
+        if y > x:
+            h = x
+            x = y
+            y = h
+        if y == 1:
             res = x + 1
         else:
-            res = gridRoutes(x - 1, y) + gridRoutes(x, y - 1)
+            res = gridRoutes(x - 1, y, gs) + gridRoutes(x, y - 1, gs)
 
         gs[x][y] = res
-    print(x, y, res)
+    # print(x, y, res)
     return res
 
+
 def dumbGridRoutes(x, y):
     if x == 1:
         return y + 1
@@ -39,9 +41,14 @@ def dumbGridRoutes(x, y):
 def main():
     print("Hello, this is Patrick")
 
-    g = gridRoutes(3, 2)
-    gd = dumbGridRoutes(3, 2)
-    print(g, gd)
+    gss = [0] * 21
+    for i in range(21):
+        gss[i] = [0] * 21
+
+    g = gridRoutes(20, 20, gss)
+    # dg = dumbGridRoutes(3, 2)
+    print(g)
+    # print(gss)
 
 if __name__ == "__main__":
     main()