typedef std::vector <Cell *> CellVector; // 376616
typedef std::vector <CellVector> MatrixOfCellPtr; // 352973
using CellVector.begin/end; // 355264
arg by ref in IsAvailable // 26050
const ref arg in IsAvailable
schema
using Matrix in CountFreeFree
wip
IsGoodSchemaAvailable
wip // 25387
example/no_solution.sdk
clean code