标签:style blog color io ar for div sp cti
题记:
这道题不难但是很有意思,有两种解题思路,可以说一种是横向扫描,一种是纵向扫描。
横向扫描:遍历所有字符串,每次跟当前得出的最长公共前缀串进行对比,不断修正,最后得出最长公共前缀串。
纵向扫描:对所有串,从字符串第0位开始比较,全部相等则继续比较第1,2...n位,直到发生不全部相等的情况,则得出最长公共前缀串。
横向扫描算法实现:
//LeetCode_Longest Common Prefix //Written by zhou //2013.11.22 class Solution { public: string longestCommonPrefix(vector<string> &strs) { // IMPORTANT: Please reset any member data you declared, as // the same Solution instance will be reused for each test case. if (strs.size() == 0) return ""; string prefix = strs[0]; for (int i = 1; i < strs.size(); ++i) { if (prefix.length() == 0 || strs[i].length() == 0) return ""; int len = prefix.length() < strs[i].length() ? prefix.length() : strs[i].length(); int j; for (j = 0; j < len; ++j) { if (prefix[j] != strs[i][j]) break; } prefix = prefix.substr(0,j); } return prefix; } };
纵向扫描代码实现:
function longestCommonPrefix(strs:Array):String{ if(strs == null || strs.length == 0)return; for(i:int = 0; i < str[0].length - 1; i++) { for(j:int = 0; j < str.length - 1; j++) { if(str[i].charAt(j) != str[0].charAt(j))return strs[0].substr(0,j); } } return strs[0]; }
[转][LeetCode]Longest Common Prefix ——求字符串的最长公共前缀
标签:style blog color io ar for div sp cti
原文地址:http://www.cnblogs.com/leoin2012/p/3985048.html