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243.Shortest-Word-Distance

243. Shortest Word Distance

题目地址

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.
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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.

代码

Approach #1 Brute Force

class Solution {
public int shortestistance(String[] words, String word1, String word2) {
int minDistance = words.length;
for (int i = 0; i < words.length; i++) {
if (words[i].equals(word1)) {
for (int j = 0; j < words.length; j++) {
if (words[j].equals(word2)) {
minDistance = Math.min(minDistance, Math.abs(i - j));
}
}
}
}
​
return minDistance;
}
}

Approach #2 One Pass

public int shortestDistance(String[] words, String word1, String word2) {
int i1 = -1, i2 = -1;
int minDistance = words.length;
int currentDistance;
for (int i = 0; i < words.length; i++) {
if (words[i].equals(word1)) {
i1 = i;
} else if (words[i].equals(word2)) {
i2 = i;
}
​
if (i1 != -1 && i2 != -1) {
minDistance = Math.min(minDistance, Math.abs(i1 - i2));
}
}
return minDistance;
}