Question: For an array arr of n positive integers, count the unordered pairs ( i , j ) ( 0 < = i < j <
For an array arr of n positive integers, count the unordered pairs i j i j n where arri XOR arrj arri AND arrj XOR denotes the bitwise XOR operation and AND denotes the bitwise AND operation. Without Time Limit Exceeds error for large arrays.
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