- #1

- 179

- 6

## Homework Statement

Python:

```
# Sudoku [[PLAIN]http://en.wikipedia.org/wiki/Sudoku][/PLAIN] [Broken]
# is a logic puzzle where a game
# is defined by a partially filled
# 9 x 9 square of digits where each square
# contains one of the digits 1,2,3,4,5,6,7,8,9.
# For this question we will generalize
# and simplify the game.
# Define a procedure, check_sudoku,
# that takes as input a square list
# of lists representing an n x n
# sudoku puzzle solution and returns the boolean
# True if the input is a valid
# sudoku square and returns the boolean False
# otherwise.
# A valid sudoku square satisfies these
# two properties:
# 1. Each column of the square contains
# each of the whole numbers from 1 to n exactly once.
# 2. Each row of the square contains each
# of the whole numbers from 1 to n exactly once.
# You may assume the the input is square and contains at
# least one row and column.
correct = [[1,2,3],
[2,3,1],
[3,1,2]]
incorrect = [[1,2,3,4],
[2,3,1,3],
[3,1,2,3],
[4,4,4,4]]
incorrect2 = [[1,2,3,4],
[2,3,1,4],
[4,1,2,3],
[3,4,1,2]]
incorrect3 = [[1,2,3,4,5],
[2,3,1,5,6],
[4,5,2,1,3],
[3,4,5,2,1],
[5,6,4,3,2]]
incorrect4 = [['a','b','c'],
['b','c','a'],
['c','a','b']]
incorrect5 = [ [1, 1.5],
[1.5, 1]]
def check_sudoku(p):
rows=[]
coloums=[]
t=0
for i in p:
for e in i:
if e not in rows:
rows.append(e)
else:
return False
rows=[]
while t<=len(p):
for i in p:
if i.pop() not in coloums:
coloums.append(i.pop())
else:
return False
coloums=[]
t += 1
return True
print check_sudoku(incorrect)
#>>> False
print check_sudoku(correct)
#>>> True
print check_sudoku(incorrect2)
#>>> False
print check_sudoku(incorrect3)
#>>> False
print check_sudoku(incorrect4)
#>>> False
print check_sudoku(incorrect5)
#>>> False
```

## Homework Equations

3. The Attempt at a Solution [/B]

I dont actually want you to correct me, i just want for you to point out where i made the mistake as my code output gives all as False. I was sure it correctly checked everything, i have no idea why its behaving this way. The first part must be correct but the second might be the problem. Do you see the mistake?

Last edited by a moderator: