I have used the summation formula for first n numbers ,first n^2 numbers so on till first n^4 numbers .

The test case is passing but I’m getting WA.

Please can anyone help me.

Your link is just the editor link.

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you don’t need n^2 or n^4 its just pattern.

example:

day 1- 1.2.3.4 = 24

day 2- 2.3.4.5 = 120

day 3- 3.4.5.6 = 360

day 4- 4.5.6.7 = 840

…

just pre compute the results

The code gives segmentation even for the given sample test case in the problem. Did you even test it?

l and r both have to be inclusive. In yours if l=1 then it will be vec[r]-vec[0] so 1st day will not be included