Zikara and the missing number

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Zikara is fond of numbers so one day while she was calculating the sum of first natural numbers while playing she lost a number but remembered the sum of the remaining numbers. Help her find the missing number if you are given the sum of first n numbers excluding the missing number. **NOTE: Use long long data-type to store values instead of int to avoid integer overflow.** ### Input - The first

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solution.cppC++17

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