using System;
using System.Collections.Generic;
using System.Linq;

class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
     *
     * 
     * @param strs string字符串一维数组 
     * @return string字符串
     */
    public string longestCommonPrefix (List<string> strs) => strs.Count == 0 ? "" : strs.Aggregate((total, next) => string.Concat(total.TakeWhile((c, i) => i < next.Length && c == next[i])));

}