why load static is used in django code example

Example 1: how to use static files in django

#In your templates, use the static template tag to build the URL for the given relative path using the configured STATICFILES_STORAGE.
{% load static %}
<img src="{% static 'my_app/example.jpg' %}" alt="My image">

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