1. 两数之和

func twoSum(nums []int, target int) []int {
    var res []int = []int{0, 0}
    var mem map[int]int = make(map[int]int)
    for i := 0; i < len(nums); i++ {
       if val, ok := mem[target-nums[i]]; ok {
          res[0], res[1] = val, i
          break
       }
       mem[nums[i]] = i
    }
    return res
}

注意，go的if 比较灵活，支持if语句前用1条语句进行初始化。