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MEXOfAnArrayO(n)Time.cpp
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MEXOfAnArrayO(n)Time.cpp
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#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define f0(i, n) for (int i = 0; i < n; i++)
#define f1(i, n) for (int i = 1; i <= n; i++)
#define int long long
#define all(x) x.begin(), x.end()
#define pb push_back
#define pii pair<int, int>
#define vi vector<int>
#define mii map<int, int>
#define mod7 1000000007
#define test(t) int t; cin>>t; while(t--)
#define setp(x, y) fixed << setprecision(y) << x
#define fast_io std::ios::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL)
signed main()
{
fast_io;
test(t){
int n;
cin>>n;
vi v(n+1);
mii mp;
f0(i,n){
cin>>v[i+1];
mp[v[i+1]]=i+1;
}
int mex=0;
mii cnt;
vi ans;
f1(i,n){
cnt[v[i]]++;
/*if(mp[mex]<i){
ans.pb(mex);
cnt.clear();
mex=0;
}*/
}
/*cout<<ans.size()<<endl;
for(auto i:ans){
cout<<i<<" ";
}*/
while(cnt[mex]){
mex++;
}
cout<<mex<<endl;
}
}