diff --git a/search.py b/search.py
index c8885a9ed..74365b535 100644
--- a/search.py
+++ b/search.py
@@ -449,7 +449,7 @@ def __call__(self, percept):
if self.s is not None:
if s1 != self.result[(self.s, self.a)]:
self.result[(self.s, self.a)] = s1
- unbacktracked[s1].insert(0, self.s)
+ self.unbacktracked[s1].insert(0, self.s)
if len(self.untried[s1]) == 0:
if len(self.unbacktracked[s1]) == 0:
self.a = None
@@ -827,7 +827,7 @@ class GraphProblemStochastic(GraphProblem):
def result(self, state, action):
return self.graph.get(state, action)
- def path_cost():
+ def path_cost(self):
raise NotImplementedError
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