The two pointers technique advances two indices through an array or list, often from both ends or at different speeds, to solve pair-sum, partitioning, and in-place problems without nested loops.
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The two pointers technique advances two indices through an array or list, often from both ends or at different speeds, to solve pair-sum, partitioning, and in-place problems without nested loops.
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Start one pointer at each end and move them inward, common for sorted-array pair and palindrome problems.
Move pointers at different speeds to detect cycles or find midpoints in linked lists.
Prefer it on sorted data or in-place rearrangement where a nested loop would be O(n squared).
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Use it on sorted arrays, pair-sum problems, palindromes, and in-place rearrangements to avoid nested loops.
One pointer moves one step and another moves two, which detects cycles and finds midpoints in a single pass.
