How should I practice Run-Length Encode a String?

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

Is Run-Length Encode a String associated with Google?

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

Problem · String

● Easy

GoogleFULLTIMEPHONE SCREEN

Given a string s, replace every maximal run of equal consecutive characters with the character followed by the run's decimal length.

Concatenate the encoded runs in their original order and return the resulting string. Return an empty string when s is empty.

runLengthEncode(s: String) → String

s = "aaabbc"return = "a3b2c1"

The maximal runs are aaa, bb, and c, with lengths 3, 2, and 1.

s = "abcd"return = "a1b1c1d1"

Every character forms a run of length one.

s = ""return = ""

There are no runs to encode.