Leetcode 细节实现 Longest Common Prefix

Longest Common Prefix

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Write a function to find the longest common prefix string amongst an array of strings.

题意：在一个字符串数组中找到最长的公共前缀

思路：

扫描数组，直到遇到一个在各个字符串不一样的字符

复杂度：时间O(n1 + n2 + ...) --> 最差的情况下，每个字符串都要扫描一遍，空间O(1)

string longestCommonPrefix(vector<string> &strs){
	if(strs.size() == 0) return "";
	if(strs.size() == 1) return strs[0];
	int c = 0;
	while(1){
		for(int i = 1; i < strs.size(); ++i){
			if(strs[i].size() <= c || strs[0].size() <= c || strs[i][c] != strs[0][c]) return strs[0].substr(0, c);
		}
		c++;
	}
}