Reverse Words in a String

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Solution Guide: Reverse Words in a String

Approach

Scan from the end of the string. Skip spaces, then capture each word boundary and append it to a result list. Join captured words with single spaces.

Complexity Analysis

Time
O(n)
Space
O(n)

Pattern

Two Pointers (Reverse Traversal)

Why It Works

Reading words from right to left directly builds reversed word order without an extra full reverse step.

Updated Feb 2026