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  1. #include <bits/stdc++.h>
  2. #include<cmath>
  3. using namespace std;
  4.  
  5. int main() {
  6.     int q;
  7.     cin>>q;
  8.     while(q--) {
  9.         int n;
  10.         cin>>n;
  11.         const int N=2e5;
  12.         int a[N];
  13.         int freq[N]={0};
  14.         for(int i=0;i<n;i++) {
  15.             cin>>a[i];
  16.             freq[a[i]]++;
  17.         }
  18.  
  19.         bool flag=false;
  20.         for(int i=0;i<n;i++) {
  21.             if(freq[a[i]]>=3) {
  22.                 cout<<a[i]<<endl;
  23.                 flag=true;
  24.                 break;
  25.             }
  26.         }
  27.  
  28.         if(flag==0) {
  29.             cout<<-1<<endl;
  30.         }
  31.     }
  32. }
  33.  
Success #stdin #stdout 0s 5316KB
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https://ideone.com/aTg4SM
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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