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#include <iostream> #include <string> #include <unordered_set> using namespace std; int main() { unordered_set<string> cars = {"Volvo", "BMW", "Ford", "Mazda"}; unordered_set<string> fruits = {"Apple", "Banana", "Cherry"}; cars.swap(fruits); cout << "cars has " << cars.size() << " elements\n"; cout << "fruits has " << fruits.size() << " elements"; return 0; }
cars has 3 elements
fruits has 4 elements
