LintCode 78: Longest Common Prefix

Longest Common Prefix
中文English
Given k strings, find the longest common prefix (LCP).

Example
Example 1:
Input: “ABCD”, “ABEF”, “ACEF”
Output: “A”

Example 2:
Input: “ABCDEFG”, “ABCEFG” and “ABCEFA”
Output: “ABC”

解法1：hash map
代码如下:

class Solution {
public:/*** @param strs: A list of strings* @return: The longest common prefix*/string longestCommonPrefix(vector<string> &strs) {int N = strs.size();if (N == 0) return "";unordered_map<string, vector<string>> hashmap;for (int i = 0; i < N; ++i) {int M = strs[i].size();for (int j = 0; j < M; ++j) {string pre = strs[i].substr(0, j + 1);hashmap[pre].push_back(strs[i]);}}string result;int maxLen = 0;for (auto h : hashmap) {if (h.second.size() == N) {if (h.first.size() > maxLen) {maxLen = h.first.size();result = h.first;}}}return result;}
};

解法2： Trie
TBD

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