how to use stl::map as two dimension array

Question

Could you let us know how to use stl:map as two dimension array? I wanted to access the individual elements as like mymap[i][j] where I do not know beforehand what the value

Answer 1

Consider using a kd-tree instead. Each level of branching will compare the i an j values in turn. See http://en.wikipedia.org/wiki/Kd-tree.