one of the possible methods is to use concept same as EXTRACT-MIN of heaps

do the following steps *m*n *times
1. print a[0][0] ans replace this by a[m-1][n-1]
2. call REORDER(0,0)

in REORDER(i,j) function we perform following operations to make array's all
row's and column's sorted
1.if a[i,j] <= a[i+1][j] && a[i,j] <= a[i][j+1], its done
else swap with min a[i+1,j]  and a[i,j+1] and keep going in same way

ans also boundary checks are also important...

TC: O(mn(m+n))
SC: O(1)

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