nums.minScore as the difference between the last and first elements after adding k to the first and subtracting k from the last.i, calculate the high as the maximum of nums[i] + k and nums[-1] - k.
b. Calculate the low as the minimum of nums[i+1] - k and nums[0] + k.
c. Update minScore with the minimum of the current minScore and high - low.minScore.