Given an array of integers `nums`

and an integer `target`

, return indices of the two numbers such that they add up to target.

Given an array of integers `nums`

and an integer `target`

, return indices of the two numbers such that they add up to target.

Solution in Go

```
func twoSum(nums []int, target int) []int {
result := make([]int, 2)
numIndex := make(map[int]int) // number -> index mapping
for i, n := range nums {
want := target - n
wantIndex, contains := numIndex[want]
if contains {
result[0] = wantIndex
result[1] = i
break
}
numIndex[n] = i
}
return result
}
```

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