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  1.  
  2. #include <bits/stdc++.h>
  3. #include <ext/pb_ds/assoc_container.hpp>
  4. using namespace __gnu_pbds;
  5. using namespace std;
  6.  
  7. typedef gp_hash_table<
  8.     int, null_type, hash<int>, equal_to<int>, direct_mask_range_hashing<int>, linear_probe_fn<>,
  9.     hash_standard_resize_policy<hash_exponential_size_policy<>, hash_load_check_resize_trigger<true>, true>>
  10.     gp;
  11.  
  12. typedef cc_hash_table<
  13.     int, null_type, hash<int>, equal_to<int>, direct_mask_range_hashing<int>,
  14.     hash_standard_resize_policy<hash_exponential_size_policy<>, hash_load_check_resize_trigger<true>, true>>
  15.     cc;
  16.  
  17. const int N = 3e6;
  18. int getTicks() {
  19.     static auto startTime = std::chrono::high_resolution_clock::now();
  20.     auto t = std::chrono::high_resolution_clock::now();
  21.     return std::chrono::duration_cast<std::chrono::milliseconds>(t - startTime).count();
  22. }
  23. int main() {
  24.     gp table;
  25.     table.resize(N);
  26.     table.set_loads({.25, .5});
  27.     int s = getTicks();
  28.     for (int i = 0; i < N; i++)
  29.         table.insert(i);
  30.     for (int i = 0; i < N; i++)
  31.         table.erase(i);
  32.  
  33.     cout << getTicks() - s << endl;
  34.     s = getTicks();
  35.     gp_hash_table<int, null_type> table2;
  36.  
  37.     for (int i = 0; i < N; i++)
  38.         table2.insert(i);
  39.     for (int i = 0; i < N; i++)
  40.         table2.erase(i);
  41.     cout << getTicks() - s << endl;
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0.25s 101312KB
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https://ideone.com/51t55C
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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