### threeSumClosest 
from typing import *
def f_gold(nums: List[int], target: int) -> int:
    def twoSumClosest(nums, start, end, target):
        res = 0
        diff = 10000
        while start < end:
            val = nums[start] + nums[end]
            if val == target:
                return val
            if abs(val - target) < diff:
                res = val
                diff = abs(val - target)
            if val < target:
                start += 1
            else:
                end -= 1
        return res
    nums.sort()
    res, n = 0, len(nums)
    diff = 10000
    for i in range(n - 2):
        t = twoSumClosest(nums, i + 1, n - 1, target - nums[i])
        if abs(nums[i] + t - target) < diff:
            res = nums[i] + t
            diff = abs(nums[i] + t - target)
    return res