#include
#include<unordered_map>
using namespace std;
int main() {
int n;
cin>>n;
unordered_map<int,int>mp;
int mx=0;
int y,r=0;
for(int i=0;i<n;i++)
{
cin>>y;
if(mp.count(y)!=0)
{
mp[y]++;
if(mp[y]>mx)
{
r=y;
mx=max(mx,mp[y]);
}
}
else
{
mp[y]++;
}
}
cout<<r;
return 0;
}
two test cases are fail
@Pritamkumarcoder, since n can be as large as 10^7 so use scanf and print instead of cin and cout as scanf and print are faster for taking input , or if you want to use cin and cout then you can add these two lines below your in main() function
ios_base::sync_with_stdio(false);
cin.tie(NULL);
also in your code check for max frequency after if else condition , refer code below for better understanding
corrected code :-
https://ide.codingblocks.com/s/281696 (using scanf and printf)
https://ide.codingblocks.com/s/281693 (using cout and cin)
In case of any doubt feel free to ask 
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