WiFi Password of Leonards Apartment

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Sheldon has Changed the WiFi Password of Leonard's Apartment. And Sheldon has dropped a card containing three integers l, r and k and has left a paper note containing the following summation: ![alt text](https://codechef_shared.s3.amazonaws.com/download/HYC/External_contest_images/COG2018/CODG1804/divisor_ques.jpg "Divisor Sum") Where **The sum of positive divisors function** $\sigma_{k}(n)$ ,

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L1 Observation

L2 Technique

L3 Approach

L4 Pseudo-code

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L5 Full solution

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solution.cppC++17

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