Chef With Leonardo

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Leonardo is the best friend of the chef and a good mathematician also. When the chef is stuck in any problem he asks for help from his friend Leonardo. Unfortunately, the chef is stuck in a problem and asks from his mathematician friend to calculate the sum from position $L$ to $R$ (Inclusive) of the special Fibonacci sequence. Special fibbonacci sequence $(sf)$ is defined as $0, 1, 1, 2, 3, 5,

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solution.cppC++17

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