LeetCode by JAVA - 1. Two Sum

package leetCode;

import java.util.Arrays;

/**
 * Created by YaphetZhao on 2017/9/5.
 */
public class _1_TwoSum {

    /**
     * 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].
     */

    public static void main(String args[]) {
        System.out.print(Arrays.toString(twoSum(new int[]{3, 2, 4}, 6)));
    }

    private static int[] twoSum(int[] nums, int target) {
        for (int i = 0; i < nums.length - 1; i++) {
            for (int j = i + 1; j < nums.length; j++) {
                if (nums[i] + nums[j] == target) {
                    return new int[]{i, j};
                }
            }
        }
        return new int[]{};
    }

}