What is the best way to design a structure for 2d map?

The key thing is i need to have an access to each attribute of each point, knowing only its x and y coordinates.

So far, i came up with idea to firstly create structure for points representation.

struct point{
    int x; //x coordinate
    int y; //y coordinate
    char symbol; //either '.'(free) or "*"(blocked)
    bool visited = false; // i need this to check whether i have been there or not
};

And then i create a 2-dimensional vector of type point, and successively push back each point. I got the following code:

//n and m are dimensions of my map
for(int i = 0; i < n; i++){ 
    for(int j = 0; j < m; j++){
        cin >> c;
        point p;
        p.x = x;
        p.y = y;
        p.c = c;
        line.push_back(p);
    }
    something.push_back(line);
    line.clear();
}

I also need the ability to distinguish points by its symbol. Is it legit to just write like that

if (map_of_something[x][y - 1].c == '*')?

Or should i delete all this rave and switch to another approach?