unordered_set 練習

tonyh

1. #include<bits/stdc++.h>
   
2. using namespace std;
   
3. //unordered_set<int> us;   //1
   
4. //unordered_set<int> us={1,1,2,3,5,3,4};   //2
   
5. /*int arr[8]={1,1,2,3,5,3,4,7};   //3
   
6. unordered_set<int> us(arr, arr+8);*/
   
7. vector<int> v={1,1,2,3,5,3,4,7};   //4
   
8. unordered_set<int> us(v.begin(), v.end());
   
9. int main()
   
10. {
    
11.     cin.tie(0);
    
12.     cin.sync_with_stdio(0);
    
13. 
    
14.     /*
    
15.     us.insert(1);
    
16.     us.insert(2);
    
17.     us.insert(7);
    
18.     us.insert(5);
    
19.     us.insert(2);
    
20.     us.insert(1);
    
21.     */
    
22. 
    
23.     for(int i: us)
    
24.         cout<<i<<endl;
    
25. 
    
26.     cout<<"----------"<<endl;
    
27.     cout<<us.size()<<endl;
    
28.     cout<<us.count(2)<<endl;
    
29.     cout<<us.count(8)<<endl;
    
30. 
    
31.     return 0;
    
32. }

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