Formula different?

#1


the formula here if this is used then we are getting the correct answer not with ((j-i+1)*(j-i+2))/2

#2

Please, save your code on the IDE before sending the link.

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This is what i see when i open the link you have shared.

#3

I am really sorry
this is the code

#4

Yes, it is correct.

What is your doubt? Can you explain it properly?

If you are asking, why the answer is not coming correct with the formula ((j-i+1)(j-i+2))/2 but with ((j-i+1)(j-i))/2.
then i would suggest you to dry run your code on sample input for both the formulas.
It would help you to understand this better.

Solution:
Both formulas are correct and would print the correct answer.
But, you have to keep one important thing in mind.

  1. for first formula,
    store array from index 1 to n
    and iterate over it i.e. i=1 to n, with j=1, initially.

  2. As you are storing the elements in array from 0th index, thus the second formula is giving correct answer in your program.

Hope, this would help.
Give a like, if you are satisfied.

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