错误：无法从“向量”转换“标签” <std::vector<std::__cxx11::basic_string<char> &gt;&gt;' 到 ' 向量<std::__cxx11::basic_string<char> &gt;' </std::__cxx11::basic_string<char></std::vector<std::__cxx11::basic_string<char>

Question

here is my code which write a column j of a board t in an other board tab : I am a beginner so I don't understand the problem :(

    vector<string> colonne(vector<vector<string>> t, int j) {
    vector<vector<string>>tab;
    for(int i=0; i<t.size(); i++){
        for(int n=0; n<=j; n++){
            if(n == j){
                tab[n]=t[j];
            }
        }
    }
    return tab;
}

here is the message from the terminal:

error: could not convert 'tab' from 'vector<std::vector<std::__cxx11::basic_string<char> >>' to 'vector<std::__cxx11::basic_string<char>>'

Answer 1

Your code has numerous problems. I think (based on your description) that the code you are trying to write is this

 vector<vector<string>> colonne(vector<vector<string>> t, int j) {
    vector<vector<string>> tab(t.size());
    tab[j]=t[j];
    return tab;
}

The code above creates a new board tab with the same number of columns as the first board. It then copies one column (with index j ) from the first board to the second board and then returns the second board.

Notice though that all the other columns in the new board will have size zero. That seems strange to me, but maybe it is what you want. If not then let me know and I try to make improvements.