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LeetCode 3474: Lexicographically Smallest Generated String Solution

Master LeetCode problem 3474 (Lexicographically Smallest Generated String), 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.

3474. Lexicographically Smallest Generated String

Hard
StringGreedyString Matching

Problem Explanation

Explanation:

To solve this problem, we can iterate through the indices of str1 and determine the characters of the resulting word based on the conditions given. We will keep track of the current prefix of the word and extend it based on the current character of str1.

  1. Initialize an empty string word to store the resulting word.
  2. Iterate through each character of str1:
    • If the current character is 'T', append the corresponding substring of str2 to the word.
    • If the current character is 'F', append a new character from the alphabet to the word.
  3. Return the resulting word.

Solution Code

class Solution {
    public String findLexSmallestString(String str1, String str2) {
        StringBuilder word = new StringBuilder();
        int n = str1.length();
        int m = str2.length();
        
        for (int i = 0; i < n; i++) {
            if (str1.charAt(i) == 'T') {
                word.append(str2);
            } else {
                word.append('a'); // Appending 'a' as it is lexicographically smallest
            }
        }
        
        return word.toString();
    }
}

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