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请大牛指点，下面的程序哪错啦，为什么总是Wrong Answer呢？

Posted by meteor5118 at 2012-04-02 21:24:42 on Problem 2623 
c(int *a){a=*a-*1[&a];}i,d[1<<18];main(){for(;~scanf("%d",d+i++););qsort(d+1,i-2,4,c);printf("%.1lf",d[i/2]/2.+d[--i/2]/2.);}
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