LeetCode: 14. Longest Common Prefix

Write a function to find the longest common prefix string amongst an array of strings.

大意就是，写一个函数可以找到一个数组字符串中的最长前缀。

分析：最长前缀的最大值为数组字符串中长度最短的字符，由最短字符串由后向前递减可以得到最长前缀。

算法构架：先遍历求得最短字符串和长度n，然后再次遍历数组，用最短字符串依次对比当前字符串前n个字符是否相等，不相等则n--，直到找到最短字符串和当前字符串前n个字符相等，继续遍历。

注意：因为是求共有的前缀，所以前缀必定满足所有字符串，因此只用单次遍历数组即可以求得答案。

public class Solution
{public String longestCommonPrefix(String[] strs) {if (strs == null || strs.length == 0){return "";}int length = strs[0].length();String res = strs[0];for (int i = 1; i < strs.length; i++){if (strs[i].length() < length){length = strs[i].length();res = strs[i];}}for (String s : strs){while (!res.equals(s.substring(0,length))){length--;res = res.substring(0,length);}}return res;}
}

复杂度为n

转载于:https://www.cnblogs.com/snakech/p/5758020.html

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