Set difference of two sets A and B is defined as the set C consisting of elements from A not present in B.

In C++, algorithm header in STL defines a function set_difference which in conjunction with inserter can be used to take set difference of two sorted range of elements.

Example:

So, this basically takes the set difference of the whole of A and B and copies those elements to C.

set_difference can even work on vectors and arrays. Just make sure that the vectors and arrays are sorted before you take the set difference.

Complexity: O(n)

In C++, algorithm header in STL defines a function set_difference which in conjunction with inserter can be used to take set difference of two sorted range of elements.

Example:

#include<algorithm> #include<set> using namespace std; .. set<int> A, B, C; .. set_difference(A.begin(), A.end(), B.begin(), B.end(), inserter(C, C.end()))

So, this basically takes the set difference of the whole of A and B and copies those elements to C.

set_difference can even work on vectors and arrays. Just make sure that the vectors and arrays are sorted before you take the set difference.

Complexity: O(n)

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