根据题意分析可知，小$$Y$$后面有$$42-22=20$$（人），$$22-20-1=1$$（人）．那么小$$M$$应该在小$$Y$$的正前方，所以小$$Y$$和小$$M$$之间有$$0$$个人．  故选：$$\text{A}$$． 
$$42$$个小朋友排成一队去秋游，从排头往后数，小$$Y$$是第$$22$$个，从排尾往前数，小$$M$$是第$$22$$个，小$$Y$$和小$$M$$中间有个人．  42 students are standing in a line. Counting from the front, Y is the 22nd. Counting from the back, M is the 22nd. There are~\uline{~~~~~~~~~~}~people between Y and M. 
1: $$0$$ 
2: $$1$$ 
3: $$2$$ 
4: $$3$$ 