当列表中的整数可能重复时，如何交换这些整数

def swap_duplicates(nums):
    num_count = {}
    for num in nums:
        if num in num_count:
            num_count[num] += 1
        else:
            num_count[num] = 1
    
    for num, count in num_count.items():
        if count > 1:
            first_index = nums.index(num)
            last_index = len(nums) - 1 - nums[::-1].index(num)
            nums[first_index], nums[last_index] = nums[last_index], nums[first_index]
    
    return nums