class Solution : def longestCommonPrefix ( self , strs : List [ str ]) -> str : Longest_sum = "" for i in range ( len ( strs [ 0 ])): for j in strs : if i >= len ( j ) or j [ i ] != strs [ 0 ][ i ]: return Longest_sum Longest_sum += strs [ 0 ][ i ] return Longest_sum PROBLEM so i...