Java LeetCode 1.Two Sum

1. Two Sum

 

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

 

   Example:

 Given nums = [2, 7, 11, 15], target = 9,

 Because nums[0] + nums[1] = 2 + 7 = 9,
 return [0, 1].


Solution：

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