Add Two Numbers
Given an array of integers, return indices of the two numbers such that they add up to a specific target.
You may assume that each input would have exactly one solution, and you may not use the same element twice.
Example:
Given nums = [2, 7, 11, 15], target = 9,
Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].
Solution
class TwoSum {
func twoSum(_ nums: [Int], _ target: Int) -> [Int] {
var dict = [Int: Int]()
for (index, value) in nums.enumerated() {
dict[value] = index
}
for (currentIndex, value) in nums.enumerated() {
if let index = dict[target - value], index != currentIndex {
return [currentIndex, index]
}
}
return []
}
}
