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1183D.cpp
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#include<bits/stdc++.h>
using namespace std;
bool f(int a, int b)
{
if(a<b)
return true;
else
return false;
}
int main()
{
int test;
cin >> test;
for(int k=0; k<test; k++)
{
int n;
cin >> n;
vector<int> cnt(n + 1);
for (int i = 0; i < n; ++i)
{
int x;
cin >> x;
++cnt[x];
}
sort(cnt.rbegin(), cnt.rend());
int ans = cnt[0];
int lst = cnt[0];
for (int i = 1; i <= n; ++i)
{
if (lst == 0)
break;
if (cnt[i] >= lst)
{
ans += lst - 1;
lst -= 1;
}
else
{
ans += cnt[i];
lst = cnt[i];
}
}
cout << ans << endl;
}
return 0;
}