Update math/fibonacci_sum.cpp

Co-authored-by: Krishna Vedala <7001608+kvedala@users.noreply.github.com>
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Sarthak Sahu 2020-10-22 02:02:42 +05:30 committed by GitHub
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* @details An algorithm to calculate the sum of Fibonacci Sequence: \f$\mathrm{F}(n) + \mathrm{F}(n+1) + .. + \mathrm{F}(m)\f$ where \f$\mathrm{F}(i)\f$
* denotes the i-th Fibonacci Number . Note that F(0) = 0 and F(1) = 1.
* The value of the sum is calculated using matrix exponentiation.
* @source https://stackoverflow.com/questions/4357223/finding-the-sum-of-fibonacci-numbers
* Reference source: https://stackoverflow.com/questions/4357223/finding-the-sum-of-fibonacci-numbers
* @author [Sarthak Sahu](https://github.com/SarthakSahu1009)
*/