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#include<bits/stdc++.h>
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using namespace std;
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int main() {
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set<int>s;
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int n;
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cin>>n;
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for(int i=1; i<=n; i++) {
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int x;
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cin>>x;
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s.insert (x);
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}
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set<int>::iterator it;
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for(it=s.begin (); it!=s.end (); it++) {
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printf("%d\n",*it);
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}
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//s.end()û<><C3BB>ֵ
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cout<<"s.begin() "<<*s.begin ()<<endl;
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//lower_bound()--<2D><><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><DAA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD>ijֵ<C4B3>ĵ<EFBFBD>һ<EFBFBD><D2BB>Ԫ<EFBFBD>صĵ<D8B5><C4B5><EFBFBD><EFBFBD><EFBFBD>
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cout<<"lower_buond 3 "<<*s.lower_bound (3)<<endl;
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//upper_bound()--<2D><><EFBFBD>ش<EFBFBD><D8B4><EFBFBD>ij<EFBFBD><C4B3>ֵԪ<D6B5>صĵ<D8B5><C4B5><EFBFBD><EFBFBD><EFBFBD>
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cout<<"upper_bound 3 "<<*s.upper_bound (3)<<endl;
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//find()--<2D><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>ָ<EFBFBD><EFBFBD><F2B1BBB2>ҵ<EFBFBD>Ԫ<EFBFBD>صĵ<D8B5><C4B5><EFBFBD><EFBFBD><EFBFBD>
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cout<<"find() 3 "<<*s.find (3)<<endl;
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cout<<"s.size() "<<s.size ()<<endl;
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return 0;
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}
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