LeetCode Longest Common Prefix
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Write a function to find the longest common prefix string amongst an array of strings.
关于这个题目的描述有歧义,究竟是求解所有字符串的最长公共前序,还是求解每对字符串中的最长的公共子序列。本题的实际是前一种情况。
思路一:思路很直接,就像直男癌一样。。。但需要注意边界输入的处理
代码如下:
class Solution {public: string longestCommonPrefix(vector<string>& strs) { string result = ""; if(strs.size() == 1) return strs[0]; for(int ind =0; strs.size() > 0;result+=strs[0][ind],ind++) for(int i=1;i<strs.size();i++) if(ind >= strs[i].size() || strs[0][ind] != strs[i][ind]) return result; return result; }};
思路二先对字符串进行排序,再求首尾两个字符串的公共前序,即为题目的求解。该思路的效率并没有提升。。。
代码如下:
class Solution {public: string longestCommonPrefix(vector<string>& strs) { string result = ""; if (strs.size() > 0){ sort(strs.begin(),strs.end()); string a = strs[0]; string b = strs[strs.size()-1]; for (int i = 0; i < a.length(); i ++){ if (b.length() > i && b[i] == a[i]){ result += b[i]; } else { return result; } } } return result; }};
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