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：$$\text{A}$$． 
$42$ children line up for the autumn outing. Counting from front to back, $Y$ is the $22$\textsuperscript{nd}. Counting from back to front, $M$ is the $22$\textsuperscript{nd}. How many children are there between $Y$ and $M$?  $$42$$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． 

(1) $$0$$ 
(2) $$1$$ 
(3) $$2$$ 
(4) $$3$$ 