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  1. //#pragma GCC optimize ("O3")
  2. //#pragma GCC target ("avx")
  3. #include "bits/stdc++.h" // define macro "/D__MAI"
  4.  
  5. using namespace std;
  6. typedef long long int ll;
  7.  
  8. #define ALL(v) (v).begin(),(v).end()
  9. #define repeat(cnt,l) for(auto cnt=0ll;cnt<(l);++cnt)
  10. #define iterate(cnt,b,e) for(auto cnt=(b);cnt!=(e);++cnt)
  11.  
  12.  
  13. #define TIME chrono::system_clock::now()
  14. #define MILLISEC(t) (chrono::duration_cast<chrono::milliseconds>(t).count())
  15.  
  16. namespace {
  17.     auto my_nice_timer = TIME;
  18.     void tic(){ my_nice_timer = TIME; }
  19.     void toc(){ printf("[%lld msec]\n", MILLISEC(TIME-my_nice_timer)); }
  20. }
  21.  
  22. struct MassiveStruct{
  23.     int my_nice_member[10000];
  24. };
  25.  
  26. struct HugeStruct{
  27.     int my_nice_member[10000];
  28.     HugeStruct(){
  29.         fill(my_nice_member, my_nice_member+10000, 11451);
  30.     }
  31. };
  32.  
  33. int main() {
  34.     {
  35.         tic();
  36.         vector<int> v;
  37.         repeat(i, 8000000){ v.push_back(i); }
  38.         toc();
  39.     }
  40.     {
  41.         tic();
  42.         vector<int> v;
  43.         v.reserve(8000010);
  44.         repeat(i, 8000000){ v.push_back(i); }
  45.         toc();
  46.     }
  47.     {
  48.         tic();
  49.         vector<int> v;
  50.         v.resize(8000010);
  51.         repeat(i, 8000000){ v[i] = i; }
  52.         toc();
  53.     }
  54.  
  55.     // =========================
  56.  
  57.     {
  58.         tic();
  59.         vector<MassiveStruct> v;
  60.         repeat(i, 1000){ v.emplace_back(); }
  61.         toc();
  62.     }
  63.     {
  64.         tic();
  65.         vector<MassiveStruct> v;
  66.         v.reserve(1005);
  67.         repeat(i, 1000){ v.emplace_back(); }
  68.         toc();
  69.     }
  70.     {
  71.         tic();
  72.         vector<MassiveStruct> v;
  73.         v.resize(1005);
  74.         toc();
  75.     }
  76.  
  77.     // =========================
  78.  
  79.     {
  80.         tic();
  81.         vector<HugeStruct> v;
  82.         repeat(i, 1000){ v.emplace_back(); }
  83.         toc();
  84.     }
  85.     {
  86.         tic();
  87.         vector<HugeStruct> v;
  88.         v.reserve(1005);
  89.         repeat(i, 1000){ v.emplace_back(); }
  90.         toc();
  91.     }
  92.     {
  93.         tic();
  94.         vector<HugeStruct> v;
  95.         v.resize(1005);
  96.         toc();
  97.     }
  98.  
  99.  
  100.     return 0;
  101. }
Success #stdin #stdout 0.11s 55208KB
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https://ideone.com/BoFr8J
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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