How should I practice Count-First Run-Length Encoding?

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

Is Count-First Run-Length Encoding associated with Bloomberg LP?

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

Count-First Run-Length Encoding

Bloomberg LP● EasyNEW GRADPHONE SCREEN

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Problem statement

Given a string text, encode each maximal run of equal consecutive characters from left to right.

For every run, append the run length in base 10 followed by the run's character. Include the count 1 for a singleton run. Return the concatenated encoding. Return the empty string when text is empty.

Function

runLengthEncode(text: String) → String

Examples

Example 1

text = "aabbcc"return = "2a2b2c"

Each of a, b, and c forms a run of length two.

Example 2

text = "aaabbcaaaaa"return = "3a2b1c5a"

The two separated runs of a are encoded independently, and the singleton c keeps count 1.

Example 3

text = ""return = ""

An empty input has no runs.

Constraints

0 <= text.length <= 100000.
text contains only lowercase English letters.
Run lengths are written with all of their decimal digits.