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- #include <bits/stdc++.h>
- using namespace std;
- long long i,n,a[1010],m;
- int main()
- {
- cin>>n;
- m=-123456781;
- for(i=1; i<=n; i++)cin >> a[i];
- sort(a+1, a+1+n);
- for(i=1; i<=n; i++){
- if(a[i]==a[i+1]){
- if(a[i]>m)m=a[i];
- }
- }
- if(m==123456781)cout<<-1;
- else cout<<m;
- return 0;
- }
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