[英語解説] Techniques You Need To Know when Working with Arrays

Double Pointer

The Two-Pointers Method, also referred to as the Fast-Slow Pointer Method, is an approach that enables the simultaneous execution of two loops within a single loop.

LeetCode No. 977
LeetCode No. 27

Sliding Window

LeetCode No. 209

Maintaining Consistency in Interval Openness/Closure

When working with intervals, it is common to employ one of two approaches:

1.Left-closed, right-open:

In this case, the left boundary is inclusive, while the right boundary is exclusive. Therefore, left boundary == right boundary is a valid scenario.

2.Left-closed, right-closed:

In this case, both the left and right boundaries are inclusive. Thus, left boundary == right boundary indicates an empty array.

Both approaches are acceptable, but it is crucial to maintain consistency in your solution to prevent confusion or errors.

Good example that you can exercise with:
LeetCode No.59
LeetCode No.704