How should I practice String Compression?

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

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String Compression

Abridge● MediumFULLTIMEOA

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Problem statement

Given a string chars, compress each maximal run of equal consecutive characters.

Write the character once.
If the run length is greater than one, immediately follow it with the decimal digits of that length.

Return the complete compressed string. Run counts may contain multiple digits.

Function

compress(chars: String) → String

Examples

Example 1

chars = "aabbccc"return = "a2b2c3"

The consecutive runs have lengths 2, 2, and 3.

Example 2

chars = "a"return = "a"

A run of length one has no numeric suffix.

Example 3

chars = "abbbbbbbbbbbb"return = "ab12"

The first run has length one, and the twelve consecutive b characters use the two digits 12.

Constraints

1 <= chars.length <= 100000.
chars contains printable ASCII characters other than line breaks.