Chewbacca and Numbers

#1

I am not able to solve can you please give a hint?

#2

Start from the leftmost digit and check if its better than replacing it with 9 - t, if its is, do so and move on to the next digit.

#3

But why start from the left end and how to access the left most digit of a number?

#4

you can start from either end and for accessing each digit, just mod number each time by 10 and then diviide the number by 10

#5

Pls look at the code https://ide.codingblocks.com/s/226984.
I am getting one wrong answer and 2 run error.

#6

Take everything in long. and check the corner cases for the number produced with leading zeros. These are the cases where your code is wrong

#7

are these the corner cases : 00987, 0999 ?

#8

No, the cases where your code can go wrong is where the number begins with a 9 and your code will check and see that since 9 - 9 i.e. 0 is less than 9, it will replace it with 0, but that would produce a result with leading zeros. This is what I mean, and please provide the new link to your code with all the things changed to long data type so I can have a look.

#9


Pls have a look.

#10

No, the logic still isn’t correct. You should avoid changing only those 9’s that occur in the starting of the number, elsewhere you are good to go.

#11

Can you pls give some example numbers, I am still not able to understand. And When I submit the code I am getting run error, why?

#12

Thanks for the help!!
There was a problem while taking input, I had used s.nextInt(); instead of s.nextLong(); that’s why I was getting rum time error.