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Fixed small errors in EightPuzzle class #987

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Merged
norvig merged 1 commit into from
Nov 30, 2018
Merged

Fixed small errors in EightPuzzle class #987

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8 changes: 4 additions & 4 deletions 8 search.py
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Original file line number Diff line number Diff line change
Expand Up @@ -415,8 +415,8 @@ def astar_search(problem, h=None):
class EightPuzzle(Problem):

""" The problem of sliding tiles numbered from 1 to 8 on a 3x3 board,
where one of the squares is a blank. A state is represented as a 3x3 list,
where element at index i,j represents the tile number (0 if it's an empty square) """
where one of the squares is a blank. A state is represented as a tuple of length 9,
where element at index i represents the tile number at index i (0 if it's an empty square) """

def __init__(self, initial, goal=(1, 2, 3, 4, 5, 6, 7, 8, 0)):
""" Define goal state and initialize a problem """
Expand Down Expand Up @@ -472,8 +472,8 @@ def check_solvability(self, state):

inversion = 0
for i in range(len(state)):
for j in range(i, len(state)):
if state[i] > state[j] != 0:
for j in range(i+1, len(state)):
if (state[i] > state[j]) and state[i] != 0 and state[j]!= 0:
inversion += 1

return inversion % 2 == 0
Expand Down
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