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Python | Print unique rows in a given boolean matrix using Set with tuples

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  • Last Updated : 26 Dec, 2017

Given a binary matrix, print all unique rows of the given matrix. Order of row printing doesn’t matter.

Examples:

Input:
    mat = [[0, 1, 0, 0, 1],
             [1, 0, 1, 1, 0],
             [0, 1, 0, 0, 1],
             [1, 1, 1, 0, 0]]
Output:
          (1, 1, 1, 0, 0)
          (0, 1, 0, 0, 1)
          (1, 0, 1, 1, 0)

We have existing solution for this problem please refer link. We can solve this problem in python quickly using Set data structure. Approach is very simple.

  1. We are given list of boolean values list, put all rows (list) in set because set contains unique values.
  2. Since list is an unhashable type for set because it is mutable that’s why first we convert each row (list) into tuple then we put all tuple in set.
  3. Resultant set will contain only unique valued tuples (row).




# Python program to Print unique rows in a 
# given boolean matrix using Set with tuples
  
# Function to print unique rows in a given boolean matrix
  
def uniqueRows(input):
  
    # convert each row (list) into tuple
    # we are mapping tuple function on each row of 
    # input matrix
    input = map(tuple, input)
  
    # put all rows in set
    result = set(input)
  
    # print all unique rows
    for row in list(result):
        print (row)
  
# Driver program
if __name__ == "__main__":
    input = [[0, 1, 0, 0, 1],
             [1, 0, 1, 1, 0],
             [0, 1, 0, 0, 1],
             [1, 1, 1, 0, 0]]
    uniqueRows(input)

Output:

(1, 1, 1, 0, 0)
(0, 1, 0, 0, 1)
(1, 0, 1, 1, 0)

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