Given an n x n matrix, where every row and column is sorted in non-decreasing order. Print all elements of matrix in sorted order. Examples:
Input : mat= [[10, 20, 30, 40],
[15, 25, 35, 45],
[27, 29, 37, 48],
[32, 33, 39, 50]]
Output : Elements of matrix in sorted order
[10, 15, 20, 25, 27, 29, 30, 32,
33, 35, 37, 39, 40, 45, 48, 50]
This problem has existing solution please refer link. We will solve this problem in python with the same approach of merging two sorted arrays using heapq module.Â
Implementation:
Python3
# Function to print all elements in sorted order# from row and column wise sorted matrixfrom heapq import mergeÂ
def sortedMatrix(mat):         # initialize result variable with first row of matrix    result=mat[0]Â
    # now traverse through complete matrix    # after first row and merge each row with    # result one by one    # after last operation result will contain    # list of sorted elements of matrix    for row in mat[1:]:        result=list(merge(result,row))Â
    return resultÂ
if __name__ == "__main__":    mat = [[10, 20, 30, 40],        [15, 25, 35, 45],        [27, 29, 37, 48],        [32, 33, 39, 50]]    print ('Elements of matrix in sorted order')    print (sortedMatrix(mat)) |
Output
Elements of matrix in sorted order [10, 15, 20, 25, 27, 29, 30, 32, 33, 35, 37, 39, 40, 45, 48, 50]
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