Reverse Vowels of a String

Easy
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Solution Guide: Reverse Vowels of a String

Approach

Use two pointers that move toward each other from both ends. Advance each pointer until it finds a vowel, then swap the vowels and continue inward.

Complexity Analysis

Time
O(n)
Space
O(n)

Pattern

Two Pointers (Converging)

Why It Works

Converging pointers ensure each vowel pair is swapped exactly once while non-vowels are skipped and left untouched.

Updated Feb 2026