How should I practice Robot Final Direction?

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

Is Robot Final Direction associated with Airbnb?

FastPrep tags this as a Airbnb coding interview or online assessment practice problem when the problem catalog has that company context.

Problem · String

Robot Final Direction

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● EasyAirbnbNEW GRADOA

Problem statement

A robot starts at position 0 on a horizontal line and follows a string commands containing only L and R.

Each L moves the robot one step to the left.
Each R moves the robot one step to the right.

After every command has been executed in order, return:

"L" if the robot stops to the left of its starting position.
An empty string if the robot stops at its starting position.
"R" if the robot stops to the right of its starting position.

A solution with time complexity no worse than O(commands.length^2) fits within the execution time limit.

Function

robotDirection(commands: String) → String

Examples

Example 1

commands = "RLLRLL"return = "L"

The first two commands and the next two commands each return the robot to its starting position. The final two L commands leave it two steps to the left, so the result is "L".

Example 2

commands = "LLRLLLRRRR"return = ""

The string contains five L commands and five R commands, so the robot returns to its starting position and the result is an empty string.

Example 3

commands = "RRL"return = "R"

Two right moves and one left move leave the robot one step to the right, so the result is "R".