How should I practice Alternate A and B with Two Workers?

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Alternate A and B with Two Workers

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Problem statement

Coordinate two concurrent workers that produce alternating letters. One worker writes only a; the other writes only b. The combined sequence starts with a and alternates strictly between the workers.

For this exercise, given n, each worker must append its letter exactly n times to one shared buffer. Start both workers, wait for both to finish, and return the buffer as a string. Use threads in Python, Java, and C++, or goroutines in Go. Synchronize the workers regardless of which is scheduled first; do not build the alternating string in one sequential worker.

Function

alternateLetters(n: int) → String

Examples

Example 1

n = 3return = "ababab"

Each worker contributes three letters, with the a worker going first.

Example 2

n = 0return = ""

Neither worker appends a character, so the shared buffer stays empty.

Example 3

n = 1return = "ab"

One handoff produces a followed by b.

Constraints

0 <= n <= 1000.
For n = 0, return the empty string.
The returned string has exactly 2n characters and contains no spaces or newline.