What is the Two-Pointer technique? Give a use case.

Difficulty: 3/10

array traversal, pair problems, in-place algorithms

Two-Pointer Technique

The Two-Pointer technique uses two indexes that move through a data structure according to the problem's constraints. It is especially effective for sorted arrays, partitioning problems, and string comparisons.

javascript

1
A classic use case is Two Sum in a sorted array.
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The technique can reduce an O(n²) brute-force search to O(n).
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It is also useful for palindrome validation and array partitioning.
4
Correct pointer movement depends on an invariant, such as sorted order.

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0-2 years experience

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