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A matrix is said to be an upper triangular matrix if the elements under the principal diagonal is 0. The matrix should be a square matrix.

For example: 

This is an example of an upper triangular matrix as all the elements below the principal diagonal is 0.

For any matrix A, if all elements Aij = 0 for all i>j.

Now, let the matrix be: 

Here we have used a 3×3 matrix. So, the index values are:

Now, the indexes where the value of i is greater than j are:

So, the values of these indices in the original matrix A will be set to 0. The target elements of the original matrix are:

These elements will be replaced by 0 and we will get the upper triangular matrix as:

INPUT: A matrix 
OUTPUT: The upper triangular matrix

PROCESS:
Step 1: [Taking the inputs]
	Read m, n [the number of rows and columns of the matrix]
	For i=0 to m-1 repeat
		For j=0 to n-1 repeat 
			Read a[i][j]
		[End of ‘for’ loop]
	[End of ‘for’ loop]
Step 2: [Finding the upper triangular matrix]
	for i = 0 to m-1 repeat
        		for j = 0 to n-1 repeat
        			if i>j then
        				print "0 "
        			else
        				print a[i][j]
			[End of ‘if’]
		[End of ‘for’ loop]
		Move to the next line
	[End of ‘for’ loop]
Step 3: Stop.