Given a square matrix, calculate the absolute difference between the sums of its diagonals.
For example, the square matrix is shown below:
1 2 3
4 5 6
9 8 9
The left-to-right diagonal = . The right to left diagonal = . Their absolute difference is .
Complete the function in the editor below.
diagonalDifference takes the following parameter:
int arr[n][m]: an array of integers
The first line contains a single integer,n , the number of rows and columns in the square matrix arr.
Each of the next n lines describes a row, arr[i], and consists of n space-separated integers arr[i].
Return the absolute difference between the sums of the matrix's two diagonals as a single integer.
3
11 2 4
4 5 6
10 8 -12
15
The primary diagonal is:
11
5
-12
Sum across the primary diagonal: 11 + 5 - 12 = 4
The secondary diagonal is:
4
5
10
Sum across the secondary diagonal: 4 + 5 + 10 = 19
Difference: |4 - 19| = 15
Note: |x| is the absolute value of x
function diagonalDifference(arr) {
// Write your code here
let ltr = 0; //left to right
let rtl = 0; //right to left
for(let i = 0; i < arr.length; i++){
ltr += arr[i][i];
rtl += arr[i][arr.length-i-1];
}
return Math.abs(ltr - rtl);
}