from typing import List def peak_finder(arr : List[int]) -> int: if len(arr) < 3: return -1 min_peak = float("inf") # let the initial value of the min peak be +infinity for i in range(len(arr) - 2): trail, mid, ahead = arr[i], arr[i + 1], arr[i + 2] if trail < mid > ahead: min_peak = min(mid, min_peak) return min_peak arr = [5, 1, 3, 2, 4, 8, 7] print(f"The min peak element in {arr} is : {peak_finder(arr)}")