Opposite-Ends Two Pointers LeetCode 345

Reverse Vowels of a String / visualized

Reverse only the vowels, leaving every consonant exactly where it is. Same converging two-pointer shape as Reverse String, but each side first skips forward past anything that isn't a vowel.

Input string

Execution

idle

Press Run to begin.

0 / 0

Speed

Java · running line

pointers on a vowel swapping done consonant (untouched)

O(n) time · O(1) extra space (excluding the output string) · consonants never move — only their positions get skipped over.