1.两数之和

class Solution {
    public int[] twoSum(int[] nums, int target) {
         int[] num = new int[2];
        for (int i = 0; i < nums.length; i++) {
            for (int j = 0; j < nums.length; j++) {
                if (target == nums[i] + nums[j]) {

                    if (i != j) {
                        num = new int[]{i, j};
                        return num;
                    } else if(i==j)
                        break;

                } else {
                    continue;
                }
            }
        }

        return num;
}
   
}