Hackerrank -> Dashboard -> Algorithms -> Warmup -> Diagonal Difference

Question

Think of your own solution for the following practice:
Given a square matrix of size N X N, calculate the absolute difference between the sums of its diagonals.
Input Format:
The first line contains a single integer, N. The next N lines denote the matrix's rows, with each line containing N space-separated integers describing the columns.
Constraints:
-100 <= elements <= 100
Output Format:
Print the absolute difference between the two sums of the matrix's 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

Answer 1

My try:
https://code.sololearn.com/W2X94y7zmSKS/?ref=app

Answer 2

My try..
https://code.sololearn.com/cfD6I6dYnhhe/?ref=app

Answer 3

@Nancy Liu you're right I didn't noticed that!🚨

Answer 4

@Nancy Because the example provided was hard-coded and 11+ 99 == 33 + 77. 😉

Answer 5

I see. Thanks for your info! I'm almost done and going to submit my attempt later! 😄

Answer 6

@Nancy Liu nice challenge! I would appreciate if you can remove the extra 3 below Sample Input and align the matrix nicely as well. 😉

Answer 7

@Zephyr Koo Thanks for your note, 3 is the input to indicate the size of the determinate~ I can align the matrix better:)

Answer 8

Here's my C# implementation ✌

LINQ One-Liner〰
Math.Abs(
pDiagonalValues.Zip(
sDiagonalValues, (x, y) => x - y).Sum()
)

Note: I didn't follow the rules exactly and generate a random matrix on-the-fly. Enjoy!

https://code.sololearn.com/cjud461mpEe8/?ref=app

Answer 9

C++ solution:
(This time I tried to define a parent Class Parent:P)
https://code.sololearn.com/c9wrXETKtc8E

Answer 10

Python solution:
(I am now practicing to solve everything with Class)
https://code.sololearn.com/cyyhTFfq5zdo

Answer 11

@Nancy Liu Glad to hear it! Thank you! 😄

Answer 12

@Krishna Teja Yeluripati Thanks for contributing your JavaScript answer:) I am wondering why the output gives zero all the time.

Answer 13

My try in Python:
https://code.sololearn.com/c80FegKyf9vN/?ref=app

Answer 14

@Zephyr Koo @ Krishna Teja Yeluripati I know the calculation~ But even I changed the matrix and run again, I still get zero as an output...

Answer 15

3
3 6 4
6 8 9
3 5 9
@Tejaswa Rastogi this is my input... but it doesn't work...

Answer 16

@Nancy do it like this:
3
3
6
4
6
8
9
3
5
9

Answer 17

@Zephyr Koo Nice coding style~

Answer 18

Hi @Tejaswa Rastogi I tried your code, the input cannot be passed well~

Answer 19

@Nancy, try giving 3(as an example) and give 9 elements for a 3*3 matrix. Enter your every input in a new line. It'll work fine. Better copy the code, and try into the terminal. I've not done input validation, so don't try to put wrong inputs! 😅