suppose if we want to swap 3 and 5
*a=3
*b=5
then,
1st xoring *a and *b and copying back to *a *a=011
*b=101
------------
*a=110
2nd--> *b^=^a ---> *b=101
*a=110
-----------
*b=011 (i.e *a) .....if we implement next step
both are swapped!
hope its clear!
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