what are static files in django used for code example

Example 1: add static file in django

STATICFILES_DIRS = [
    BASE_DIR / "static",
    '/var/www/static/',
]

Example 2: using static files in django

Input: 
         1
       /   \
      2     3
Output: 1
Explanation: 
Tilt of node 2 : 0
Tilt of node 3 : 0
Tilt of node 1 : |2-3| = 1
Tilt of binary tree : 0 + 0 + 1 = 1