two sum O(n^2) solution

two_sum.go

func twoSum(nums []int, target int) []int {
    if nums == nil {
        return nil
    }
    
    for i := 0; i < len(nums); i++ {
        for j := i+1; j < len(nums); j++ {
            if nums[i] + nums[j] == target {
                return []int{i, j}
            }
        }
    }
    
    return []int{}
}