由于题目数据范围来到了1000，那么肯定不能用n^3的方法暴力枚举每一个数，因此，只能想办法优化掉一层循环。 由于题目的要求与顺序无关，所以可以考虑对数组进行从小到大排序。对数组排序后，我们枚举第一个数x，那么就只要找到与另外两个数的和k=target-x ...

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