HDU 1029

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<string.h>
 4 #include<math.h>
 5 
 6 int cmp(const void *a,const void *b){
 7     return *(int *)a-*(int *)b;
 8 }
 9 
10 int main(){
11     int i,j,n,a[999999];
12     while(scanf("%d",&n)!=EOF){
13         for(i=0;i<n;i++){
14             scanf("%d",&a[i]);
15         }
16         qsort(a,n,sizeof(int),cmp);
17         printf("%d\n",a[n/2]);
18     }
19     return 0;
20 }