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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long int t,n,b,c,d,e,f,i,j,k,l;
- cin>>t;
- while(t--)
- {
- cin>>b;
- long long int a[b+5];
- d=0;
- e=0;
- f=0;
- for(i=1; i<=b; i++)
- {
- a[i]=0;
- }
- for(i=1; i<=b; i++)
- {
- cin>>c;
- a[c]++;
- if(a[c]==1)
- {
- d++;
- }
- e=max(e,a[c]);
- }
- f=max(min(d-1,e),min(d,e-1));
- cout<<f<<endl;
- }
- return 0;
- }
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