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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 q; cin >> q;
  22.     ordered_set<ll> st;
  23.     while (q--)
  24.     {
  25.         char s; ll x; cin >> s >> x;
  26.         if(s == 'I')
  27.         {
  28.             st.insert(x);
  29.         }
  30.         else if (s == 'D')
  31.         {
  32.             st.erase(x);
  33.         }
  34.         else if (s == 'K')
  35.         {
  36.             if(x>st.size())
  37.             {
  38.                 cout << "invalid" << nl;
  39.             }
  40.             else{
  41.                 x--;
  42.                 cout << *st.find_by_order(x) << nl;
  43.             }
  44.         }
  45.         else
  46.         {
  47.             cout << st.order_of_key(x) << nl;
  48.         }
  49.     }
  50. }
  51.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/0pSTw3
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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