*p,*q;main(i,m,n){for(;p<q||~scanf("%d%d",&m,p=q=&n,i=1);i++%n?:printf(p<q?"%d ":"%d\n",*q--))*++q=i>m?*++p:i;}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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