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#include<bits/stdc++.h>
using namespace std;
int main() {
set<int> s;
s.insert(1);
s.insert(2);
s.insert(3);
cout<<"set 中 1 出现的次数是 ："<<s.count(1)<<endl;
cout<<"set 中 4 出现的次数是 ："<<s.count(4)<<endl;
return 0;
}
