LeetCode9.Array and String — Longest Common Prefix 最长共同前缀
Posted hu-19941213
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Write a function to find the longest common prefix string amongst an array of strings.
If there is no common prefix, return an empty string ""
.
Example 1:
Input: ["flower","flow","flight"]
Output: "fl"
Example 2:
Input: ["dog","racecar","car"]
Output: ""
Explanation: There is no common prefix among the input strings.
Note:
All given inputs are in lowercase letters a-z
.
存储string类型的向量一定程度上可以看成二维数组。 最重要的思想是按照最小长度的字符串作为最外层遍历循环。
class Solution public: string longestCommonPrefix(vector<string>& strs) //首先,找到所有字符串中最短的那一个. int min=0; for (int i = 0; i < strs.size(); i++) if (min < strs[i].size()) min = strs[i].size(); if (min == 0) return "" ; //然后根据最短的那个字符串进行遍历 string result="" ; int counter = 0;//计数器 for (int i = 0; i < min; i++) char compare = strs[0][i]; for (int j = 0; j < strs.size(); j++) if (strs[j][i] == compare) continue; else return result; result.push_back(compare); return result; ;
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