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

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

14th Sep 2017, 4:08 PM
S Liu
S Liu - avatar
19 Answers
15th Sep 2017, 7:35 AM
Krishna Teja Yeluripati
Krishna Teja Yeluripati - avatar
15th Sep 2017, 8:23 AM
kamakshi
kamakshi - avatar
+ 7
@Nancy Liu you're right I didn't noticed that!🚨
18th Sep 2017, 11:22 AM
Zephyr Koo
Zephyr Koo - avatar
+ 4
@Nancy Because the example provided was hard-coded and 11+ 99 == 33 + 77. πŸ˜‰
16th Sep 2017, 2:44 AM
Zephyr Koo
Zephyr Koo - avatar
+ 3
I see. Thanks for your info! I'm almost done and going to submit my attempt later! πŸ˜„
14th Sep 2017, 4:17 PM
Zephyr Koo
Zephyr Koo - avatar
+ 2
@Nancy Liu nice challenge! I would appreciate if you can remove the extra 3 below Sample Input and align the matrix nicely as well. πŸ˜‰
14th Sep 2017, 3:38 PM
Zephyr Koo
Zephyr Koo - avatar
+ 2
@Zephyr Koo Thanks for your note, 3 is the input to indicate the size of the determinate~ I can align the matrix better:)
14th Sep 2017, 4:07 PM
S Liu
S Liu - avatar
+ 2
Here's my C# implementation ✌ LINQ One-Linerγ€° 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
14th Sep 2017, 4:27 PM
Zephyr Koo
Zephyr Koo - avatar
+ 2
C++ solution: (This time I tried to define a parent Class Parent:P) https://code.sololearn.com/c9wrXETKtc8E
14th Sep 2017, 5:20 PM
S Liu
S Liu - avatar
+ 1
Python solution: (I am now practicing to solve everything with Class) https://code.sololearn.com/cyyhTFfq5zdo
14th Sep 2017, 3:18 PM
S Liu
S Liu - avatar
+ 1
@Nancy Liu Glad to hear it! Thank you! πŸ˜„
15th Sep 2017, 9:39 AM
Zephyr Koo
Zephyr Koo - avatar
+ 1
@Krishna Teja Yeluripati Thanks for contributing your JavaScript answer:) I am wondering why the output gives zero all the time.
15th Sep 2017, 8:23 PM
S Liu
S Liu - avatar
17th Sep 2017, 3:02 AM
Tejaswa Rastogi
Tejaswa Rastogi - avatar
+ 1
@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...
18th Sep 2017, 9:23 AM
S Liu
S Liu - avatar
+ 1
3 3 6 4 6 8 9 3 5 9 @Tejaswa Rastogi this is my input... but it doesn't work...
18th Sep 2017, 10:18 PM
S Liu
S Liu - avatar
+ 1
@Nancy do it like this: 3 3 6 4 6 8 9 3 5 9
19th Sep 2017, 5:46 AM
Tejaswa Rastogi
Tejaswa Rastogi - avatar
0
@Zephyr Koo Nice coding style~
14th Sep 2017, 5:39 PM
S Liu
S Liu - avatar
0
Hi @Tejaswa Rastogi I tried your code, the input cannot be passed well~
18th Sep 2017, 9:24 AM
S Liu
S Liu - avatar
0
@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! πŸ˜…
18th Sep 2017, 10:50 AM
Tejaswa Rastogi
Tejaswa Rastogi - avatar