JAVA Max Value from a String that contains only digits

Question

I have some problem with an exercise from geeksforgeeks portal. I don't know why they say to me wrong answer. I have completed the function and my results on their visible test cases is good. Maybe i don't understand what they want from me to solve in the problem? Can you help me please?

The problem is this

My code is this:

//Your Code here
   long answer = 0;

   for (int i = 0; i < str.length(); i++)
   {
       long multiply = (str.charAt(i) - 48) * answer;
       long sum = (str.charAt(i) - 48) + answer;

       if (multiply > sum)
           answer = multiply;
       else if (sum > multiply)
       answer = sum;
   }
   System.out.println(answer);

And as you can see... my solution works for the visible test cases:

Important!!! They don't show the input test cases where the code have failed. They don't show any input of the test cases.

EDITED: some request of custom input to show (also changed a little the if else statement... included now the possibility of equals sum and multiply

Answer 1

Your code contains a small bug due to the following if-else statements:

if (multiply > sum)
    answer = multiply;
else if (sum > multiply)
    answer = sum;

You forgot the condition when sum equals multiply. In that case, your answer variable remains unchanged in that iteration and you will get a wrong answer finally.

Now sum == multiply can occur for the test case of "22" --> your code gives answer as 2, while the answer should be 4.

This might be one of the test cases failing for your code.