题解 | #两数之和#
两数之和
https://www.nowcoder.com/practice/20ef0972485e41019e39543e8e895b7f
using System; using System.Collections.Generic; using System.Collections; class Solution { /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param numbers int整型一维数组 * @param target int整型 * @return int整型一维数组 */ public List<int> twoSum (List<int> numbers, int target) { List<int> res = new List<int>(); Hashtable hash = new Hashtable(); for(int i = 0; i < numbers.Count; i++){ if(hash.ContainsKey(target - numbers[i])){ res.Add(Convert.ToInt32(hash[target - numbers[i]])); res.Add(i + 1); return res; } else { if(!hash.ContainsKey(numbers[i])){ hash.Add(numbers[i], i + 1); } } } return res; } }