B快。因为fortran语言中,数据在内存中的顺序为:1,12,13,14,15,16,17,18,19,110,111,112,1......100,11,22,23,24,25,26,27,28,29,210,211,212,2......100,21,32,33,34,35,36,37,38,39,310,311,312,3......