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- #include<bits/stdc++.h>
- using namespace std;
- int ar[2000],mark[2000];
- int main()
- {
- ios_base::sync_with_stdio(false);
- cin.tie(NULL);
- #ifndef ONLINE_JUDGE
- freopen("input.cpp","r",stdin);
- #endif // ONLINE_JUDGE
- int n,maxi=0,cnt=0;
- cin>>n;
- bool bl=0;
- for(int i=0;i<n;i++)cin>>ar[i];
- for(int i=0;i<n;i++)
- {
- for(int j=i-1;j>=0;j--)
- {
- if(ar[i]==ar[j] && mark[j]!=2)
- {
- mark[i]=2;
- bl=1;
- break;
- }
- }
- if(bl && mark[i]!=2)
- {
- for(int j=i+1;j<n;j++)
- {
- if(ar[i]==ar[j] && mark[j]!=2)mark[i]=2;
- }
- }
- if(bl && mark[i]!=2)bl=0;
- }
- for(int i=0;i<n;i++)
- {
- if(mark[i]==2)
- {
- cnt++;
- maxi=max(cnt,maxi);
- }
- }
- cout<<maxi<<endl;
- //for(int i=0;i<n;i++)cout<<mark[i];
- return 0;
- }
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