I have a positive integer array- {1,5,8,2,10} and a given value 7. I need to find whether a subset of the array exists such that the XOR of its elements is the value 7. In this case the subset is {5,2} because 5 xor 2 is 7. One naive solution is to find all the subsets and check whether a solution exist.I want some algorithm better than the naive. NOTE:-I just need to find whether a solution exists or not.I don't need to find the subset.
Efficient algorithm to find whether a subset of an integer array exists,the xor of all its elements is a given value?
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This boils down to solving a system of linear equations over the finite field with two elements (GF(2)). Bitwise XOR here is equivalent to adding two vectors. The sample inputs correspond to vectors like so.
The system looks like this.
The following Python code uses Gaussian elimination and is implemented using bitwise operations. For fixed-width integers, it runs in linear time. Forgive me for not reexplaining Gaussian elimination when there are a million better treatments on the Internet already.