How should I practice Run-Length String Compression?

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

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Problem · String

Run-Length String Compression

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● Easy

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Problem statement

Given a string s, compress each maximal group of consecutive equal characters.

Append the group's character once.
If the group contains more than one character, append its full length in base 10.
If the group contains exactly one character, do not append a count.

Return the compressed string.

Function

compressString(s: String) → String

Examples

Example 1

s = "aaaabeee"return = "a4be3"

The groups are aaaa, b, and eee. Their encodings are a4, b, and e3.

Example 2

s = "a"return = "a"

The only group has length 1, so no count is appended.

Example 3

s = "abbbbbbbbbbbb"return = "ab12"

The first group contributes a. The following group contains 12 copies of b, so it contributes b12.

Constraints

1 <= s.length <= 2000
s contains letters, digits, or symbols.