LeetCode14. Longest Common Prefix
2018-01-07 21:39
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题目:
Write a function to find the longest common prefix string amongst an array of strings.题目分析:
题目意思是给定一个字符串的数组,要我们求出这些字符串数组的最长公共前缀,这里的前缀必定是从字符串的开头开始的首先最长公共前缀必定是由这些字符串中最短的那个决定的,因此我们可以先找出这些字符串中最短的那个,然后用他的每个前缀和其他字符串对比,从而得出最长公共前缀,得到一个字符串的每个字串我们可以用c++string库里的substr函数
c++代码:
class Solution { public: string longestCommonPrefix(vector<string>& strs) { if (strs.size() == 0) return ""; if (strs.size() == 1) return strs[0]; int min_length = strs[0].size(), temp_str = 0; for (int i = 0; i < strs.size(); i++) { if (strs[i].size() < min_length) { min_length = strs[i].size(); temp_str = i; } } string result; for(int i = min_length; i >= 0; i--){ result = strs[temp_str].substr(0,i); int j = 0; for(; j < strs.size(); j++){ if(j == temp_str) continue; string temp = strs[j].substr(0,i); if(result != temp) break; } if(j == strs.size()) return result; } return result; } };
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