This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <stdio.h>
int arr[1000];
int main()
{
int n,s=0,i;
scanf("%d",&n);
for(i=0;i<n;i++)
scanf("%d",&arr[i]);
for(i=1;i<n;i++)
s^=arr[i];
printf("%d",s);
return 0;
}
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