The answer
By convention, the outer loop uses 'i', the first inner loop uses 'j', and a third inner loop uses 'k'.
What is a Nested Loop and When Do You Need It?
What variables are commonly used for nested loops?
More FAQs in What is a Nested Loop and When Do You Need It?
A nested loop is a loop construct (like a for or while loop) placed completely inside the body of another loop.
For every single iteration of the outer loop, the inner loop executes its entire cycle from start to finish.
They are primarily used to traverse multi-dimensional data (like matrices) or to compare every element in a list against every other element.
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