package main

import "fmt"

func main() {

	var nums = []int{2, 7, 11, 15}
	var target = 10
	fmt.Println(twoSum(nums, target))
}

func twoSum(nums []int, target int) []int {
	var mark = map[int]int{}
	for index, num := range nums {
		if _, ok := mark[num]; ok {
			continue
		}
		mark[num] = index
	}
	for index, num := range nums {
		var _, ok = mark[target-num]
		if !ok {
			continue
		}
		if mark[target-num] == index {
			continue
		}
		return []int{
			index, mark[target-num],
		}

	}
	return []int{}
}