LeetCode 2243: Calculate Digit Sum of a String Solution

Master LeetCode problem 2243 (Calculate Digit Sum of a String), 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.

2243. Calculate Digit Sum of a String

Easy

String Simulation

Problem Explanation

Explanation

We will iterate over the string s in rounds until its length is less than or equal to k.
In each round, we will divide s into groups of size k, calculate the digit sum of each group, and merge the results.
We repeat this process until the length of s is less than or equal to k.

Time Complexity: O(n * m), where n is the length of the string s and m is the number of rounds
Space Complexity: O(n), where n is the length of the string s

Solution Code

class Solution {
    public String calculateDigitSum(String s, int k) {
        while (s.length() > k) {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < s.length(); i += k) {
                int sum = 0;
                for (int j = i; j < Math.min(i + k, s.length()); j++) {
                    sum += s.charAt(j) - '0';
                }
                sb.append(sum);
            }
            s = sb.toString();
        }
        return s;
    }
}

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What is the time complexity of LeetCode 2243 (Calculate Digit Sum of a String)?

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