#include "sequence.h"
#include <bits/stdc++.h>
#define pb push_back
#define fst first
#define snd second
#define fore(i,a,b) for(ll i=a,apio=b;i<apio;i++)
#define SZ(x) ((int)x.size())
#define ALL(x) x.begin(),x.end()
#define mset(a,v) memset((a),(v),sizeof(a))
#define imp(v) for(auto slkdh:v)cout<<slkdh<<" ";cout<<"\n"
using namespace std;
typedef long long ll;
typedef pair<ll,ll> ii;
int sequence(int N, std::vector<int> A) {
ll n=N;
vector<ll>a(n);
fore(i,0,n)a[i]=A[i]-1;
vector<ll>pos[n];
fore(i,0,n)pos[a[i]].pb(i);
ll res=0;
fore(i,0,n){
ll q=SZ(pos[i]),m=0;
fore(j,0,SZ(pos[i])-1){
ll l=pos[i][j],r=pos[i][j+1];
if(l+1!=r){
m=r-l-1;
res=max({res,l-pos[i][0]+1,pos[i].back()-r+1});
}
}
if(m==0){
res=max(res,q);
continue;
}
if(n-m>=m)res=max(res,q);
}
return res;
}
