How should I practice Reverse a String with Two Pointers?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Snowflake phone screen problems in FastPrep.

Is Reverse a String with Two Pointers associated with Snowflake?

FastPrep tags this as a Snowflake phone screen coding practice problem when the problem catalog has that company and stage context.

Reverse a String with Two Pointers

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Problem statement

Given a string s, return its characters in reverse order. Preserve every character exactly, including spaces, punctuation, and letter case.

Use two pointers that move inward from opposite ends. You may copy the input to a mutable character array, swap the two pointed-to characters, and return the resulting string. The empty string returns the empty string.

Function

reverseString(s: String) → String

Examples

Example 1

s = "hello"return = "olleh"

Swap h with o and e with l; the middle l stays in place.

Example 2

s = "A b!"return = "!b A"

Spaces and punctuation reverse just like letters; case is unchanged.

Constraints

0 <= s.length <= 10000.
Every character is printable ASCII, with character code from 32 through 126.