A11:两数之和

Posted 2020-09-01

给一个整数数组，找到两个数使得他们的和等于一个给定的数 target。

你需要实现的函数twoSum需要返回这两个数的下标, 并且第一个下标小于第二个下标。注意这里下标的范围是 1 到 n，不是以 0 开头。

 注意事项

你可以假设只有一组答案。

样例

给出 numbers = [2, 7, 11, 15], target = 9, 返回 [1, 2].

 

 1 import java.util.Arrays;
 2 
 3 /**
 4  * Created by Tutotu on 2017/2/26.
 5  * <p>
 6  * Realname:yangmingzhu
 7  * <p>
 8  * Tel:[phone]
 9  * <p>
10  * Email:[email protected]
11  */
12 
13 public class Solution11 {
14     /*
15     * @param numbers : An array of Integer
16     * @param target : target = numbers[index1] + numbers[index2]
17     * @return : [index1 + 1, index2 + 1] (index1 < index2)
18     */
19     public int[] twoSum(int[] numbers, int target) {
20         // write your code here
21         int[] temp = Arrays.copyOf(numbers,numbers.length);
22         int heigh = 0;
23         int low = 0;
24         int[] location = new int[2];
25         int i=0;
26         Arrays.sort(temp);
27         heigh = temp.length-1;
28         while(low < heigh && (temp[low] + temp[heigh] != target)){
29             if(temp[low] + temp[heigh] < target){
30                 low++;
31             }
32             if(temp[low] + temp[heigh] > target){
33                 heigh--;
34             }
35         }
36         System.out.print(low + "" + heigh) ;
37 
38 
39             while(i<numbers.length && numbers[i] != temp[low]){
40                 i++;
41             }
42             location[0] = i+1;
43             i = numbers.length-1;
44             while(i>0 && numbers[i] != temp[heigh]){
45                 i--;
46             }
47             location[1] = i+1;
48         Arrays.sort(location);
49         return location;
50     }
51 
52 
53     public static void print(int[] paramter){
54         for(int i=0; i<paramter.length; i++)
55             System.out.print(paramter[i]);
56     }
57     public static void main(String[] args){
58         int[] a = new int[]{0,4,3,0};
59         print(new Solution11().twoSum(a,-1));
60     }
61 }