http://en.wikipedia.org/wiki/Sparse_array Sparse array http://en.wikipedia.org/wiki/Sparse_array sparse arrays http://en.wikipedia.org/wiki/Sparse_array English Sparse array sparse sparse arrays sparse sparse sparse array sparse sparse array sparse SparseArray sparse arrays Sparse array Sparse array sparse ÅÃdkÃ© vektory http://en.wikipedia.org/wiki/Sparse_array http://en.wikipedia.org/wiki/Sparse_array SparseArray sparse arrays sparse arrays sparse array Row の数は少ない http://en.wikipedia.org/wiki/Sparse_array