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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int n,cc,dm;
  4. deque<int>p;
  5. map<int,bool>m;
  6. signed main()
  7. {
  8.     cin>>n;
  9.     int a[n+1];
  10.     for (int i=1;i<=n;i++)
  11.     {
  12.         cin>>a[i];
  13.         m[a[i]]=false;
  14.     }
  15.     int res=0;
  16.     for (int i=1;i<=n;i++)
  17.     {
  18.         if (m[a[i]]==false)
  19.         {
  20.             p.push_front(i);
  21.             m[a[i]]=true;
  22.         }
  23.         else if (m[a[i]]==true)
  24.         {
  25.             while (!p.empty()&&a[p.back()]!=a[i])
  26.             {
  27.                 p.pop_back();
  28.             }
  29.             if (!p.empty()) p.pop_back();
  30.             p.push_front(i);
  31.         }
  32.         cc=p.size();
  33.         res=max(res,cc);
  34.     }
  35.     cout<<res;
  36. }
  37.  
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/nwbAJC
language:
C++14 (clang 8.0)
created:
310 days ago
visibility:
secret

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