LeetCode 848: Shifting Letters Solution

Master LeetCode problem 848 (Shifting Letters), 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.

848. Shifting Letters

Medium

Array String Prefix Sum

Problem Explanation

Explanation

To solve this problem, we will iterate through the shifts array in reverse order. For each position i, we calculate the total shift value by summing up all shifts from position i to the end. Then, we apply this total shift value to the character at position i in the string s. We can optimize this process by reducing the total shift modulo 26 to avoid unnecessary full cycles through the alphabet.

Time Complexity: O(n) where n is the length of the input string s. Space Complexity: O(n) for the output string.

Solution Code

class Solution {
    public String shiftingLetters(String s, int[] shifts) {
        StringBuilder sb = new StringBuilder();
        int shiftSum = 0;
        
        for (int i = shifts.length - 1; i >= 0; i--) {
            shiftSum = (shiftSum + shifts[i]) % 26;
            char shifted = (char) (((s.charAt(i) - 'a' + shiftSum) % 26) + 'a');
            sb.insert(0, shifted);
        }
        
        return sb.toString();
    }
}

Try It Yourself

Loading code editor...

Frequently Asked Questions

How to solve LeetCode 848 (Shifting Letters)?

This page provides optimized solutions for LeetCode problem 848 (Shifting Letters) 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 848 (Shifting Letters)?

The time complexity for LeetCode 848 (Shifting Letters) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.

Can I run code for LeetCode 848 on DevExCode?

Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 848 in Java, C++, or Python.

Back to LeetCode Solutions