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- #include<bits/stdc++.h>
- using namespace std;
- int a[1000],b[1000];
- int main()
- {
- int t,c,i,j,d=0;
- scanf("%d",&t);
- for(i=1;i<=t;i++)
- {
- scanf("%d",&b[i]);
- if(a[b[i]]==0)
- d++;
- a[b[i]]=i;
- }
- cout<<d<<endl;
- for(j=1;j<=t;j++)
- {
- if(a[b[j]]==j) printf("%d ",b[j]);
- }
- return 0;
- }
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