How should I practice Canonical Directory After CD Commands?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Meta onsite interview problems in FastPrep.

Is Canonical Directory After CD Commands associated with Meta?

FastPrep tags this as a Meta onsite interview coding practice problem when the problem catalog has that company and stage context.

Canonical Directory After CD Commands

Meta● MediumFULLTIMEONSITE INTERVIEW

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Problem statement

Start in the root directory /. Execute each path operand in commands as one directory-change operation, then return the final canonical absolute path.

An operand beginning with / starts from root; any other operand starts from the current directory.
Split an operand at each /. Ignore empty segments and the exact segment .. The exact segment .. moves to the parent directory, but root has no parent.
Every other segment is a literal directory name, including ... and ..... The paths describe navigation only; filesystem existence is not checked.

The result begins with one slash, has one slash between names, and has no trailing slash unless it is root. Return / when there are no commands.

Function

cdPath(commands: String[]) → String

Examples

Example 1

commands = ["projects/ml", "../vision", "/tmp//a/./", "../../logs"]return = "/logs"

The third command resets to /tmp/a. The final two parent segments reach root before logs is added.

Example 2

commands = ["../../", "a/../b", "./c"]return = "/b/c"

Parent steps at root stay at root; the later relative commands enter b then c.

Example 3

commands = ["x/.../y", "../z"]return = "/x/.../z"

Three periods form a literal directory name, unlike the exact parent token ..

Example 4

commands = []return = "/"

With no commands the current directory remains root.

Constraints

0 <= commands.length <= 10000.
Each operand is nonempty; the total number of characters is at most 100000.
Operands contain English letters, digits, underscores, periods, and slashes only.