//给定一个整数数组 nums 和一个目标值 target,请你在该数组中找出和为目标值的那 两个 整数,并返回他们的数组下标。
/*
1、将数组的值和value当做key-value存放在dictionary中
2、判断target减去当前value得到的result是否存在dictionary中
3、若存在则代表value+result=target,则返回value和result的index
4、若不存在则将value存入dictionary中
*/
func twoSum(_ nums: [Int], _ target: Int) -> [Int] {
var dict = [Int: Int]()
for (index, value) in nums.enumerated() {
if let lastIndex = dict[target - value] {
return [lastIndex, index]
}
dict[value] = index
}
return [0]
}
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