Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution.
在3Sum基础上改改就行
package pack;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
/*
* 求三数和为0,遍历一个数,以它为定点,再转化为2Sum
*/
class Solution {
public int threeSumClosest(int[] nums, int targ

给定一个包含n个整数的数组S,找出数组中三个数的和,使得它们的和最接近给定的目标值。返回这三个数的和。可以假设每个输入都恰好有一个解。
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