SeHwan Dev Blog

What is ‘__dirname’?

The **dirname in a node script returns the path of the folder where the current JavaScript file resides. **filename and __dirname are used to get the filename and directory name of the currently executing file.

When I use express.js as a backend, I faced some issues with ‘__dirname’.

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.