cpp第一次用set和vector

 1 #include<cstdio>
 2 #include<iostream>
 3 #include<cstring>
 4 #include<algorithm>
 5 #include<set>
 6 #include<vector>
 7 
 8 #define rep(i,m,n)for(int i=m;i<n;i++)
 9 #define clr(a,x)memset(a,x,sizeof(a))
10 
11 using namespace std;
12 
13 set<int> x;
14 vector<int> ans;
15 int t,n,a;
16 int main()
17 {    
18     cin>>t;
19         while(t--){
20         cin>>n;
21         x.clear();
22         ans.clear();
23          rep(i,0,n){
24              scanf("%d",&a);
25             if (x.find(a)==x.end()){
26                 x.insert(a);
27                 ans.push_back(a);
28             }    
29          }
30         rep(i,0,ans.size()){
31             printf("%d",ans[i]);
32             if (i!=ans.size()-1) printf(" ");
33         }    
34         printf("\n");
35     }
36     return 0;
37 }