# Find the original matrix when largest element in a row and a column are given in Python

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Suppose we have two arrays A and B of size N and M respectively and we also have one N X M binary matrix where 1 denotes that there was a positive integer in the original matrix and 0 means that position is holding 0 into the original matrix also. We have to generate the original matrix so that A[i] denotes the largest element in the ith row and B[j] denotes the largest element in the jth column.

So, if the input is like A = [4, 2, 3], B = [3, 1, 0, 0, 4, 0, 5] matrix, then the output will be matrix

To solve this, we will follow these steps −

• N := size of A

• M := size of B

• for i in range 0 to N, do

• for j in range 0 to M, do

• if mat[i, j] is same as 1, then

• display minimum of A[i] and B[j]

• otherwise,

• print a new line

## Example

Let us see the following implementation to get better understanding −

Live Demo

def print_original_mat(A, B, mat) :
N = len(A)
M = len(B)
for i in range(N) :
for j in range(M) :
if (mat[i][j] == 1) :
print(min(A[i], B[j]), end = " ")
else :
print(0, end = " ")
print()
A = [4, 2, 3]
B = [3, 1, 0, 0, 4, 0, 5]
mat = [
[1, 0, 0, 0, 1, 0, 1],
[0, 0, 1, 0, 0, 1, 1],
[1, 1, 0, 1, 1, 0, 0]]
print_original_mat(A, B, mat);

## Input

[4, 2, 3],
[3, 1, 0, 0, 4, 0, 5],
[[1, 0, 0, 0, 1, 0, 1],
[0, 0, 1, 0, 0, 1, 1],
[1, 1, 0, 1, 1, 0, 0]]

## Output

3 0 0 0 4 0 4
0 0 0 0 0 0 2
3 1 0 0 3 0 0
Updated on 27-Aug-2020 06:30:23