[Java]Leetcode14 Longest Common Prefix
2015-04-17 16:02
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Write a function to find the longest common prefix string amongst an array of strings.
就是一个字符数组,找字符数组中所有字符串中的最常前缀。
解题思路:首先两个字符比较,找出最长前缀,然后拿前缀与其他字符比较。这里面要注意的是,比较的次数最多是最短字符的长度。
就是一个字符数组,找字符数组中所有字符串中的最常前缀。
解题思路:首先两个字符比较,找出最长前缀,然后拿前缀与其他字符比较。这里面要注意的是,比较的次数最多是最短字符的长度。
public String longestCommonPrefix(List<String> strs) { int strsLen=strs.size(); if(strsLen==0)return ""; int i=0; String str=null; String longestCommonPrefix=""; while(i<strsLen) { str=strs.get(i); if(i==0)longestCommonPrefix=str; else longestCommonPrefix=LCP2String(str,longestCommonPrefix); i++; } return longestCommonPrefix; } public String LCP2String(String str1,String str2)//比较两个字符的最长前缀 { int len1=str1.length(); int len2=str2.length(); int len=len1>len2?len2:len1; int i=0; char ch1=' '; char ch2=' '; while(i<len) { ch1=str1.charAt(i); ch2=str2.charAt(i); if(ch1==ch2)i++; else break; } if(i==0)return ""; else return str1.substring(0,i); }
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