Given a list of words and two words word1 and word2, return the shortest distance between these two words in the list.

For example,
Assume that words = ["practice", "makes", "perfect", "coding", "makes"].

Given word1 = “coding”, word2 = “practice”, return 3.
Given word1

Note:
You may assume that word1 does not equal to word2, and word1 and word2 are both in the list.

給定單詞列表以及單詞1和單詞2，返回列表中這兩個單詞之間的最短距離。

例如，

假設words=[“practice”、“makes”、“perfect”、“coding”、“makes”]。

給定word1=“coding”，word2=“practice”，返回3。

給定word1=“makes”，word2=“coding”，返回1。

注：

您可以假定word1不等於word2，word1和word2都在列表中。

 1 class Solution {
 2     func shortestDistance(_ words: [String],_ word1:String,_ word2:String) -> Int {
 3         var idx:Int = -1
 4         var res:Int = Int.max
 5         for i in 0..<words.count
 
 6         {
 7             if words[i] == word1 || words[i] == word2
 8             {
 9                 if idx != -1 && words[idx] != words[i]
10                 {
11                     res = min(res, i - idx)
12                 }
13                 idx = i
14             }
15         }
16         return res
17     }
18 }