How should I practice Encode or Decode Message?

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Problem · String

Encode or Decode Message

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● Easy

Goldman SachsOA

Problem statement

Encodes or decodes a message using a shared numeric key.

Input

Operation:

1 = Encode
2 = Decode

Message (string)
Key (positive integer)

Encoding (Operation 1)

Duplicates each character based on the corresponding digit in the key.

Example:

Message: Open, Key: 123 → Output: Oppeen

Decoding (Operation 2)

Compresses repeated characters based on digits in the key.

Example:

Message: Oppeen, Key: 123 → Output: Open

Rules

Apply digits in key cyclically or until message ends.

Remaining characters (if key ends first) are left unchanged.

Return -1 for invalid input or mismatched patterns during decoding.

Function

encodeOrDecode(operation: int, message: String, key: int) → String

Examples

Example 1

operation = 1message = "Open"key = 123return = "Oppeen"

Example 2

operation = 2message = "Oppeen"key = 123return = "Open"

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Problem statement

Function

Examples

Example 1

Example 2

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