题解 | #两数之和#

using System;
using System.Collections;
using System.Collections.Generic;


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) {
        // write code here
        if (numbers.Count == 2) return new List<int>() {
            1, 2
        };
        if (numbers.Count == 2) return new List<int>() {
            1, 2
        };
        List<int> res = new List<int>();
        Dictionary<int, int> dic = new Dictionary<int, int>();
        for (int i = 0; i < numbers.Count; i++) {
            int temp = target - numbers[i];
            if (dic.ContainsKey(temp)) {
                res.Add(i + 1);
                res.Add(dic[temp] + 1);
            } else {
                if (!dic.ContainsKey(numbers[i])) dic.Add(numbers[i], i);
            }
        }
        res.Sort();
        return res;
    }
}