Here is updated solution in python, java, c++, c and javascript programming - https://programmingoneonone.com/hackerrank-bigger-is-greater-problem-solution.html

c++ solution, disliking the fact that I spent a bit too long thinking about how to do this, no cause the problem explenation sucks.

string biggerIsGreater(string w) {
    int n = w.length();
    int i = n - 2;

    while (i >= 0 && w[i] >= w[i + 1]) {
        i--;
    }

    if (i < 0) return "no answer"; 

    int j = n - 1;
    while (w[j] <= w[i]) {
        j--;
    }

    swap(w[i], w[j]);

    reverse(w.begin() + i + 1, w.end());

    return w;
}

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import java.io.; import java.util.; import java.util.stream.*;

class Result {

public static String biggerIsGreater(String w) {
    char[] chars = w.toCharArray();
    int i = chars.length - 2;

    // Step 1: Find the first character that is smaller than its next character from the end
    while (i >= 0 && chars[i] >= chars[i + 1]) {
        i--;
    }

    if (i < 0) {
        return "no answer";
    }

    // Step 2: Find the smallest character on the right of i that is greater than chars[i]
    int j = chars.length - 1;
    while (chars[j] <= chars[i]) {
        j--;
    }

    // Step 3: Swap them
    char temp = chars[i];
    chars[i] = chars[j];
    chars[j] = temp;

    // Step 4: Reverse the suffix starting at i + 1
    int left = i + 1, right = chars.length - 1;
    while (left < right) {
        temp = chars[left];
        chars[left] = chars[right];
        chars[right] = temp;
        left++;
        right--;
    }

    return new String(chars);
}

}

public class Solution { public static void main(String[] args) throws IOException { BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in)); BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

    int T = Integer.parseInt(bufferedReader.readLine().trim());

    IntStream.range(0, T).forEach(TItr -> {
        try {
            String w = bufferedReader.readLine();
            String result = Result.biggerIsGreater(w);
            bufferedWriter.write(result);
            bufferedWriter.newLine();
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }
    });

    bufferedReader.close();
    bufferedWriter.close();
}

}