Unable to get the difference at the correct position

#1

I am getting all the differences at the 1 index

#2

@Vishu_1801,

https://ide.codingblocks.com/s/219542 I have corrected your code.

Add char to your stringbuilder and then add the difference. After the loop, just add the last char to your stringbuilder.

This approach is much better as compared to insertion because after you insert a char in your stringbuilder, the length changes and you need to keep a count of where you are inserting your next char.

1 Like
#3

Sir Can we change the length of the stringbuilder if yes then how??

#4

@Vishu_1801,
keep a variable j and do i+j instead of i+1. and increment j by 1 in every iteration.

#5

Sorry sir i am unable to comprehend that

#6

for what are we taking this variable i+j I mean what will be the purpose of this

#7

@Vishu_1801,

		int d = (int)s.charAt(i+1) - (int)s.charAt(i);
		sb.insert( i+1, d);

let’s say that sb is acb.
here i=0, d = 2, now d will be inserted at i+1 or at index = 1; hence sb becomes a2cb
now i++;
here i=1,d= -1, now d will be again inserted at i+1 or at index = 2; but sb now is a2-1cb

Now if we keep a variable j. We count the number of insertions with j.

here i=0, j=1, d = 2, now d will be inserted at i+j or at index = 1; hence sb becomes a2cb
now i++; and j++;
here i=1, j=2, d= -1, now d will be again inserted at i+j or at index = 3; and sb is a2c-1b

1 Like
#8

Thankyou sir i got that

#9

@Vishu_1801,

Please mark the doubt as resolved and if you have any more doubts please reply on this thread. Also, please rate your experience. :sweat_smile:

#10

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