leetcode Two sum

问题：Given an array of integers, find two numbers such that they add up to a specific target number.

The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Please note that your returned answers (both index1 and index2) are not zero-based.

You may assume that each input would have exactly one solution.

Input: numbers={2, 7, 11, 15}, target=9
Output: index1=1, index2=2

解决方法（java版）刚刚开始接触leetcode，写的算法效率可能不高，欢迎吐槽。

public class Solution{
 public int[] twoSum(int [] numbers,int target){
  int[] array=new int[2];
  for(int i=0;i<numbers.length;i++){
   for(int j=i+1;j<numbers.length;j++){
    if(numbers[i]+numbers[j]==target){
     array[0]=i+1;
     array[1]=j+1;
    }
   }
  }
  return array;
 }
}