How should I practice Classify Final Robot Displacement?

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

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Classify Final Robot Displacement

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Problem statement

A robot starts at vertical position 0 and follows the characters in commands from left to right.

U moves the robot one step up.
D moves the robot one step down.

Return \"U\" if the final position is above the start, an empty string if it is at the start, or \"D\" if it is below the start.

Function

classifyVerticalDisplacement(commands: String) → String

Examples

Example 1

commands = "UUDDUDU"return = "U"

Four up moves and three down moves leave the robot one step above the start.

Example 2

commands = "UDDU"return = ""

Two up moves and two down moves cancel, so the robot returns to its starting position.

Constraints

1 <= commands.length <= 100000
commands contains only U and D.