Write a definition for the following C++ function:bool up_then_down(const int* arr, int n);// REQUIRES: n >= 1; elements arr[0] ... a[n-1] exist.// PROMISES: Returns true if the sequence of element values is strictly increasing// from a[0] to the first appearance of the maximum value, then strictly decreasing// from the first appearance of the maximum value to a[n - 1].// Otherwise, returns false. EXAMPLES (maximum values are bold):// The return value would be true for all of these sequences ...// {10}, {10, 20}, {20, 10}, {10, 20, 30, 25}, {10, 20, 30, 25, -2}// But would be false for all of these ...// {10, 20, 10, 15}, {10, 10, 20, 15}, {10, 20, 20, 15}.

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