LeetCode 14. Longest Common Prefix(字符串)
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LeetCode 14. Longest Common Prefix(字符串)
- LeetCode 14 Longest Common Prefix字符串
- 问题描述
- 解题思路
- 参考代码
- By Scarb
- Scarb’s Blog
Tags:
- String
问题描述
Write a function to find the longest common prefix string amongst an array of strings.
解题思路
题意是要找出一个字符串数组中最长的前缀公共子串。
我先将字符串排序,最短的放最前面。然后遍历所有字符串,为最短字符串的每一位都分别与其他字符串进行比较。
如果都相同,那最大长度加以,否则跳出循环。
参考代码
#include <string>#include <vector>#include <iostream>#include <algorithm>using namespace std;class Solution {public: string longestCommonPrefix(vector<string>& strs) { if (strs.size() <= 0) return ""; int max_len = 0; bool flag; sort(strs.begin(), strs.end()); for (int i = 0; i < strs[0].length(); ++i) { flag = true; char ch = strs[0][i]; for (auto str : strs) { if (str[i] != ch) { flag = false; break; } } if (!flag) break; ++max_len; } return strs[0].substr(0, max_len); }};int main(){ vector<string> strs = { "12345", "1234", "123", "12354" }; auto sl = new Solution(); cout << sl->longestCommonPrefix(strs) << endl; system("pause"); return 0;}
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