两数之和 for循环暴力求解 HashMap public class Solution { public static void main(String[] args) { int[] res = twoSum2(new int[]{1, 2, 3, 4, 5, 6, 70}, 75); System.out.println(Arrays.toString(res)); } // 1. for // 时间复杂度:O(n^2) 遍历两次数组 // 空间复杂度:O(1) 未申请额外空间 public static int[] twoSum(int[...