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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
![Diagonal Difference in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct] 2 image 39](https://technorj.com/wp-content/uploads/2021/12/image-39.png)
Return
- int: the absolute diagonal difference
Input Format
![Diagonal Difference in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct] 3 image 40](https://technorj.com/wp-content/uploads/2021/12/image-40.png)
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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