数据结构 例:找21 234567891011 513192137566475808892 low mid 1234567891011 513192137566475808892 Ow mid high 2345678 513192137566475808892 lowmid high数据结构 tjm 例：找21 low mid high 1 2 3 4 5 6 7 8 9 10 11 5 13 19 21 37 56 64 75 80 88 92 1 2 3 4 5 6 7 8 9 10 11 5 13 19 21 37 56 64 75 80 88 92 low mid high 1 2 3 4 5 6 7 8 9 10 11 5 13 19 21 37 56 64 75 80 88 92 lowmid high