Returns: int or None: The index of the last local extremum. If no local extremum is found, returns None. """ # Iterate over the array from the second element to the second last element for i in range(1, len(arr) - 1): if find_max and arr[i] > arr[i-1] and arr[i] > arr[i+1]: # Found a local maximum, update and continue last_extremum_index = i elif not find_max and arr[i] < arr[i-1] and arr[i] < arr[i+1]: # Found a local minimum, update and continue last_extremum_index = i

Here is a simple Python function to find the last local maximum or minimum in an array:

Parameters: arr (list): The input array. find_max (bool): If True, find the last local maximum; otherwise, find the last local minimum.

print(f"Last local maximum index: {last_max_index}") print(f"Last local minimum index: {last_min_index}") This function works by iterating through the array, checking each element to see if it's a local maximum or minimum based on the find_max parameter. The index of the last local extremum found is returned. The function also handles edge cases for the first and last elements. If no local extremum is found, the function returns None .