How should I practice Unique Paths?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Bloomberg LP phone screen problems in FastPrep.

Is Unique Paths associated with Bloomberg LP?

FastPrep tags this as a Bloomberg LP phone screen coding practice problem when the problem catalog has that company and stage context.

Unique Paths

Bloomberg LP● MediumNEW GRADPHONE SCREEN

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Problem statement

A robot starts in the top-left cell of a rows x columns grid and may move only one cell right or one cell down. Return the number of distinct paths to the bottom-right cell.

Function

uniquePaths(rows: int, columns: int) → int

Examples

Example 1

rows = 3columns = 7return = 28

Every path uses two down moves and six right moves.

Example 2

rows = 1columns = 5return = 1

A one-row grid has only the all-right path.

Constraints

1 <= rows, columns <= 20.
The answer fits in a signed 32-bit integer.