Given an array of $n$ integers, your task is to process $q$ queries of the form: what is the xor sum of values in range $[a,b]$ ?
The first input line has two integers $n$ and $q$ : the number of values and queries.
The second line has $n$ integers $x_1,x_2,\dots,x_n$ : the array values.
Finally, there are $q$ lines describing the queries. Each line has two integers $a$ and $b$ : what is the xor sum of values in range $[a,b]$ ?
Print the result of each query.
8 4 3 2 4 5 1 1 5 3 2 4 5 6 1 8 3 3· \n · · · · · · · \n · \n · \n · \n · \n
3 0 6 4\n \n \n \n