1.two sum.java

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