Diagonal Difference in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

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Algorithm Solution in Hackerrank | Java Hackerrank Solutions

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Introduction To Algorithm

The word Algorithm means “a process or set of rules to be followed in calculations or other problem-solving operations”. Therefore Algorithm refers to a set of rules/instructions that step-by-step define how a work is to be executed upon in order to get the expected results. 

Advantages of Algorithms:

  • It is easy to understand.
  • Algorithm is a step-wise representation of a solution to a given problem.
  • In Algorithm the problem is broken down into smaller pieces or steps hence, it is easier for the programmer to convert it into an actual program.

Link for the Problem – Diagonal Difference– Hacker Rank Solution 

Diagonal Difference – Hacker Rank Solution

Problem:

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
image 39

Return

  • int: the absolute diagonal difference

Input Format

image 40

Output Format

Return the absolute difference between the sums of the matrix’s two diagonals as a single integer.

Sample Input

3
11 2 4
4 5 6
10 8 -12

Sample Output

15

Explanation

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

Diagonal Difference – Hacker Rank Solution
public class DiagonalDifference {
	
	static int diagonalDifference(int[][] arr) {
		int leftSum = 0, rightSum = 0;
		int n = arr.length;
		for (int i = 0; i < n; i++) {
			leftSum += arr[i][i];
			rightSum += arr[i][n - 1 - i];
		}
		return (Math.abs(leftSum - rightSum));
	}
}

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