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 <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
int a[n];
for(int i=0;i<n;i++)
{
cin >> a[i];
}
int cnt =0;
for(int i=0 ;i<n/2;i++)
{
if(a[i]!=a[n-i-1])
cnt++;
}
cout << cnt;
return 0;
}
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