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Grokking the Coding Interview Patterns

Generate Parentheses

Explore how to generate all valid combinations of balanced parentheses for a specified number using subset-related patterns. Understand the problem constraints and apply backtracking strategies to create efficient and correct solutions suitable for coding interviews.

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Statement

For a given number, n, generate all combinations of balanced parentheses.

Constraints:

  • 1≤1 \leq n ≤10\leq 10

Examples

Understand the problem

Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

Generate Parentheses

1.

Which is a valid combination of balanced parentheses when n = 2?

A.

()()

(())

((()

B.

(())

))((

()()

C.

()()

(())

1 / 3

Figure it out!

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Sequence - Vertical
Drag and drop the cards to rearrange them in the correct sequence.
1
2
3
4
5

Try it yourself

Implement your solution in the following coding playground:

Java
usercode > Main.java
import java.util.*;



public class Main{

    public static ArrayList<String> generateCombinations(int n) {

		

        // Replace this placeholder return statement with your code

        

        ArrayList<String> result = new ArrayList<String>();

		return result;

	}

}
Generate Parentheses