How should I practice Round-Robin WDL Order?

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

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Round-Robin WDL Order

Hudson River Trading● EasyNEW GRADINTERNOA

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Problem statement

Given a string inputStr containing only W, D, and L, build a reordered string by consuming the available characters cyclically in this order:

Append W if any W characters remain.
Append D if any D characters remain.
Append L if any L characters remain.

Repeat this cycle until every input character has been consumed. When a character is exhausted, skip it in later cycles while continuing to consume the other characters in the same cyclic order.

Return the reordered string.

Function

solution(inputStr: String) → String

Examples

Example 1

inputStr = "LDWDL"return = "WDLDL"

The first round appends W, then D, then L. The remaining D and L are appended in that order during the next round.

Example 2

inputStr = "WWWLLDDLD"return = "WDLWDLWDL"

There are three copies of each character, so three complete W, D, L rounds consume the string.

Example 3

inputStr = "LLLL"return = "LLLL"

Every round skips W and D, then appends one remaining L.

Constraints

Every character in inputStr is W, D, or L.