LeetCode 2821: Delay the Resolution of Each Promise Solution

Master LeetCode problem 2821 (Delay the Resolution of Each Promise), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2821. Delay the Resolution of Each Promise

Medium

Problem Explanation

Explanation:

To delay the resolution of each promise, we need to create a wrapper promise that waits for a given delay before resolving. We can achieve this by creating a new Promise object that resolves after the specified delay.

Algorithm:

Create a new Promise object that resolves after the specified delay using a setTimeout function.
Return this new Promise object as the delayed promise.

Time Complexity: O(1)
Space Complexity: O(1)

Solution Code

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;

public class DelayPromise {
    public CompletableFuture<Void> delayPromise(CompletableFuture<Void> promise, long delayMs) {
        return CompletableFuture.delayedExecutor(delayMs, TimeUnit.MILLISECONDS).execute(() -> promise.join());
    }
}

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What is the time complexity of LeetCode 2821 (Delay the Resolution of Each Promise)?

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