How should I practice Telephone Keypad String Encoding?

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

Is Telephone Keypad String Encoding associated with Epic?

FastPrep tags this as a Epic online assessment coding practice problem when the problem catalog has that company and stage context.

Problem · String

Telephone Keypad String Encoding

Learn this problem

● Easy

EpicFULLTIMEOA

Problem statement

Encode text using a traditional telephone keypad. Letters on keys 2 through 9 require one through four presses according to their position on the key.

Ignore spaces and treat uppercase and lowercase letters identically.
If two consecutive encoded letters use the same key, insert # between their digit sequences.

Return the complete encoded string.

Function

encodeKeypad(text: String) → String

Examples

Example 1

text = "AB"return = "2#22"

A and B share key 2, so a separator is inserted.

Example 2

text = "HEY EPIC"return = "4433999337444222"

The space is ignored and no adjacent encoded letters share a keypad key.

Constraints

1 <= text.length <= 100000
text contains English letters and spaces.
text contains at least one letter.