Can we solve the question by sorting the given array

#1

like first if we solve the given array we get
1 1 1 2 3 3 3

then we write code like
sort(arr ,arr+n);
int i=0;
while( i<n)
{
if(arr[i]==arr[i+1]==arr[i+2])
{

i=i+3;
}
else
{
cout<<a[i];
break;
}
}

what is wrong in it please answer this this doubt it create confusion

#2

ur logic is correct.
while accessing index make sure i , i+1 ,i+2 should not be greater than or equal to n.

i.e i<n && i+1<n && i+2<n

#3

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