算法练习--单词距离

题目：

有个内含单词的超大文本文件，给定任意两个单词，找出在这个文件中这两个单词的最短距离(相隔单词数)。如果寻找过程在这个文件中会重复多次，而每次寻找的单词不同，你能对此优化吗?

示例：

输入：words = ["I","am","a","student","from","a","university","in","a","city"], word1 = "a", word2 = "student"
输出：1

代码：

class Solution {
    public int findClosest(String[] words, String word1, String word2) {
        int l=Integer.MAX_VALUE;
        int w1=-1;
        int w2=-1;
       
        for(int i=0;i