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  1. #include <bits/stdc++.h>
  2. #include <ext/pb_ds/assoc_container.hpp>
  3. #include <ext/pb_ds/tree_policy.hpp>
  4.  
  5. using namespace std;
  6. using namespace __gnu_pbds;
  7. using ll = long long;
  8. using ld = long double;
  9.  
  10. #define all(x)  x.begin(),x.end()
  11. #define v(x) vector<x>
  12. #define nl '\n'
  13. #define fxd(x) fixed << setprecision(x)
  14. template<class t> using ordered_set = tree<t, null_type, less<t>, rb_tree_tag, tree_order_statistics_node_update>;
  15. template<class t> using ordered_multiset = tree<t, null_type, less_equal<t>, rb_tree_tag, tree_order_statistics_node_update>;
  16.  
  17.  
  18. int main()
  19. {
  20.     ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
  21.     int n ; cin >> n;
  22.     v(ll) arr(n); for (int i = 0; i < n; i++) cin >> arr[i];
  23.  
  24.     ll l =0 , r =0 , mxlen = 0;
  25.     // val,freq
  26.     map<ll,ll>mp;
  27.     for (int r = 0; r < n; r++)
  28.     {
  29.         mp[arr[r]]++;
  30.         if(mp[arr[r]] == 1)
  31.         {
  32.             mxlen = max(mxlen,r-l+1);
  33.         }
  34.         else
  35.         {
  36.             while (mp[arr[r]] > 1)
  37.             {
  38.                 mp[arr[l++]]--;
  39.             }
  40.  
  41.         }
  42.     }
  43.     cout << mxlen;
  44. }
Success #stdin #stdout 0s 5304KB
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https://ideone.com/7WUnhg
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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