LeetCode 3337: Total Characters in String After Transformations II Solution

Master LeetCode problem 3337 (Total Characters in String After Transformations II), a hard 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.

3337. Total Characters in String After Transformations II

Hard

Hash Table Math String Dynamic Programming Counting

Problem Explanation

Explanation:

The problem can be solved by simulating the transformations on the string s for t iterations.
For each character in the string, we calculate its transformed version based on the nums array.
We update the string s with the transformed characters.
Repeat this process for t iterations and return the length of the final transformed string modulo 10^9 + 7.

Time Complexity: O(t * n) where n is the length of the input string s. Space Complexity: O(n) for storing the transformed string.

Solution Code

class Solution {
    public int totalCharacters(String s, int t, int[] nums) {
        int mod = 1000000007;
        for (int i = 0; i < t; i++) {
            StringBuilder sb = new StringBuilder();
            for (char c : s.toCharArray()) {
                int index = c - 'a';
                for (int j = 0; j < nums[index]; j++) {
                    sb.append((char)('a' + (index + j) % 26));
                }
            }
            s = sb.toString();
        }
        return s.length() % mod;
    }
}

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