How should I practice Longest Common Prefix Length?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Visa online assessment problems in FastPrep.

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Longest Common Prefix Length

Visa● EasyFULLTIMEOA

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Problem statement

You are given two strings a and b.

Return the length of their longest common prefix: the longest string that begins at index 0 in both inputs. Character comparisons are case-sensitive.

Function

longestCommonPrefixLength(a: String, b: String) → int

Examples

Example 1

a = "flower"b = "flow"return = 4

Both strings begin with flow, and the second string ends after four characters.

Example 2

a = "abc"b = "xyz"return = 0

The first characters differ, so the common prefix is empty.

Constraints

0 <= a.length, b.length <= 10⁵
The combined input length is at most 2 * 10⁵.
Both strings contain printable ASCII characters.