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- // Example program
- #include <iostream>
- #include <string>
- #include <vector>
- using namespace std;
- vector <int> vec{3,2,3,2,1};
- int main()
- {
- int ans = 0;
- for(int i =0; i<vec.size(); i++)
- {
- ans ^=vec.at(i);
- }
- cout << ans;
- }
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