Answer Posted / priyanshu

#include<stdio.h>
#include<iostream>
#include<algorithm>
using namespace std;
long int find(long int a[],long int n,long int f,long int l)
{
long int mid;
mid=(f+l)/2;
if(a[mid]==a[mid+1])
{
return find(a,mid,mid+1,n-1);
}
else if(a[mid]==a[mid-1])
{
return find(a,mid,0,mid-1);
}
else
return a[mid];
}

int main()
{
long int n,i;
scanf("%ld",&n);
long int a[n];
for(i=0;i<n;i++)
scanf("%ld",&a[i]);
sort(a,a+n);
printf("%ld",find(a,n,0,n-1));
return 0;
}

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