How should I practice Lexicographically Minimum Stack Encryption?

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

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Problem · String

Lexicographically Minimum Stack Encryption

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● MediumRipplingOA

Problem statement

You are given a string originalString. Start with two empty strings: temporaryString and encryptedString.

Repeat either of the following operations until both originalString and temporaryString are empty:

Remove the first character of originalString and append it to temporaryString.
Remove the last character of temporaryString and append it to encryptedString.

Choose the operation order that produces the lexicographically smallest possible encryptedString, and return that string.

Function

minimumEncryptedString(originalString: String) → String

Examples

Example 1

originalString = "dby"return = "bdy"

Move d and then b into the temporary stack. Pop b first, then arrange the remaining legal moves to produce bdy.

Example 2

originalString = "vgxgpu"return = "ggpuxv"

The minimum legal encrypted string is ggpuxv.

Constraints

1 <= originalString.length() <= 200000
originalString contains lowercase English letters.