Description

Given a string, return its encoding defined as follows:

• First, the string is divided into the least possible number of disjoint substrings consisting of identical characters
  • for example, "aabbbc" is divided into ["aa", "bbb", "c"]
• Next, each substring with length greater than one is replaced with a concatenation of its length and the repeating character
  • for example, substring "bbb" is replaced by "3b"
• Finally, all the new strings are concatenated together in the same order and a new string is returned.

Note: A substring of a string S is another string S’ that occurs in S. For example, “Fights” is a substring of “CodeFights”, but “CoFi” isn’t.

Example

For s = "aabbbc", the output should be lineEncoding(s) = "2a3bc".

Input/Output

• [execution time limit] 4 seconds (js)

• [input] string s

String consisting of lowercase English letters.

Guaranteed constraints: 4 ≤ s.length ≤ 15.

• [output] string

Encoded version of s.

[JavaScript (ES6)] Syntax Tips

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// Prints help message to the console
// Returns a string
function helloWorld(name) {
    console.log("This prints to the console when you Run Tests");
    return "Hello, " + name;
}