coding test

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 = 1+5+9=15. The right to left diagonal = 3+5+9=17 . Their absolute difference is |15-17|=2.

For this problem, we need to use ‘2D list’ in Java.

스택은 가장 나중에 들어온 자료가 가장 먼저 처리되는 LIFO(Last-In-First-Out) 자료구조이다. 구멍이 하나밖에 없는 병이라고 생각하면 이해하기 쉽다.

An array ‘A’ consisting of ‘N’ integers is given. Rotation of the array means that each element is shifted right by one index, and the last element of the array is moved to the first place. For example, the rotation of array A = [3, 8, 9, 7, 6] is [6, 3, 8, 9, 7] (elements are shifted right by one index and 6 is moved to the first place).