vector<string> or vector< vector<char> >?
问题 I'm working on a Boggle game solver that would read lines of a text file (the board). I've been going back and forth if I should use a vector of string s or a vector matrix of char s. I'm thinking the vector of chars would be easier to access as it would be myvec[y][x] where the vector of string s would require me to use the string.at() function. I don't know which would have a better performance if I should parse each line in to the char s or leave the line as a string and access each char