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- #include<iostream>
- #include<set>
- using namespace std;
- int main() {
- set<int> s;
- s.insert(5);
- s.insert(5);
- s.insert(6);
- s.insert(10);
- cout << s.size() << " ";
- s.erase(5);
- cout << s.size() << " ";
- cout << *lower_bound(s.begin(), s.end(), 7);
- }
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