题目地址：https://leetcode-cn.com/problems/shortest-word-distance/
题目描述
Given a list of words and two words word1 and word2, return the shortest distance between these two words in the list.
Example:
Assume that words = ["practice", "makes", "perfect", "coding", "makes"].
Input: word1 = “coding”, word2 = “practice”
Output: 3
Input: word1 = "makes", word2 = "coding"
Output: 1
Note:
- You may assume that word1 does not equal to word2, and word1 and word2 are both in the list.
题目大意
给定一个单词列表和两个单词 word1 和 word2，返回列表中这两个单词之间的最短距离。
解题方法
字典
字典保存每个单词出现位置，然后对于word1和word2的位置两两交叉求最小值即可。
C++代码如下：
class Solution {
public:
int shortestDistance(vector<string>& words, string word1, string word2) {
unordered_map<string, vector<int>> position;
for (int i = 0; i < words.size(); ++i) {
position[words[i]].push_back(i);
}
int res = INT_MAX;
for (int i : position[word1]) {
for (int j : position[word2]) {
res = min(res, i < j ? j - i : i - j);
}
}
return res;
}
};
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