class Solution {
public int[] twoSum(int[] nums, int target) {
for (int i = 0; i < nums.length;i++){
for(int j = i + 1;j < nums.length;j++){
if (nums[j] == target - nums[i]){
return new int[] { i , j };
}
}
}
throw new IllegalArgumentException("No two sum solution");
}
}