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#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int v[5005],v2[5005],vc[5005],cont[5005],bin[5005],n,j;
ifstream in("secv.in");
ofstream out("secv.out");
int bs(int k){
int l,r,med=1;
l=0;
r=j;
while(l<=r && vc[med]!=k){
med=(r+l)/2;
if(vc[med]<k)
l=med+1;
else
if(vc[med]>k)
r=med-1;
}
if(vc[med]==k)
return med;
else
return -1;
}
int main()
{
int aux,lc=0,u=1,lmin=INT_MAX,nrd=0;
in>>n;
for(int i=1;i<=n;i++)
in>>v[i],v2[i]=v[i];
sort(v2+1,v2+n+1);
for(int i=1;i<=n;i++)
if(v2[i]>v2[i-1])
vc[j++]=v2[i];
for(int i=1;i<=n;i++){
int poz;
bin[i]=bs(v[i]);
}
for(int i=1;i<=n;i++){
int poz;
poz=bin[i];
cont[poz]++;
if(cont[poz]==1)
nrd++;
lc++;
if(nrd==j){
while(cont[bin[u]]>0 && u<=i){
if(cont[bin[u]]==1)
break;
cont[bin[u]]--;
lc--,u++;
}
if(lc<lmin)
lmin=lc;
}
}
out<<lmin;
return 0;
}