LeetCode 2103: Rings and Rods Solution

Master LeetCode problem 2103 (Rings and Rods), a easy 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.

2103. Rings and Rods

Easy

Hash Table String

Problem Explanation

Explanation:

To solve this problem, we need to iterate through the given rings and count the number of rods that have all three colors of rings on them. We can use a HashMap to keep track of the distinct colors on each rod. We iterate through the rings in pairs and update the HashMap accordingly. Finally, we count the number of rods that have all three colors.

Create a HashMap to store the colors on each rod.
Iterate through the rings in pairs.
Update the HashMap with the colors on each rod.
Count the number of rods that have all three colors.

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

Solution Code

class Solution {
    public int countRodsWithAllColors(String rings) {
        int n = rings.length() / 2;
        Map<Character, Set<Character>> rodsColors = new HashMap<>();
        for (int i = 0; i < n; i++) {
            char color = rings.charAt(2 * i);
            char rod = rings.charAt(2 * i + 1);
            rodsColors.putIfAbsent(rod, new HashSet<>());
            rodsColors.get(rod).add(color);
        }
        
        int count = 0;
        for (Set<Character> colors : rodsColors.values()) {
            if (colors.size() == 3) {
                count++;
            }
        }
        
        return count;
    }
}

Try It Yourself

Loading code editor...

Frequently Asked Questions

How to solve LeetCode 2103 (Rings and Rods)?

This page provides optimized solutions for LeetCode problem 2103 (Rings and Rods) in Java, C++, and Python, along with a detailed explanation and an interactive code editor to test your code.

What is the time complexity of LeetCode 2103 (Rings and Rods)?

The time complexity for LeetCode 2103 (Rings and Rods) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.

Can I run code for LeetCode 2103 on DevExCode?

Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 2103 in Java, C++, or Python.

Back to LeetCode Solutions