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  1. #include<stdio.h>
  2. #include<time.h>
  3. #include<stdlib.h>
  4.  
  5. int cardnum[13];
  6.  
  7. void Initialize();
  8. int GetCard();
  9. int Loop();
  10. void ShowCards();
  11.  
  12. int main() {
  13.     srand((unsigned)time(NULL));
  14.     int loop = 10000000, lp = loop;
  15.     int cnt = 0;
  16.     while(lp--) {
  17.         Initialize();
  18.         if(Loop()) {
  19.             ++cnt;
  20.             //ShowCards();
  21.         }
  22.     }
  23.     printf("%lf\n", (double)cnt / loop);
  24. }
  25.  
  26. void Initialize() {
  27.     int i;
  28.     for(i = 0; i < 13; ++i) cardnum[i] = 0;
  29. }
  30.  
  31. int GetCard() {
  32.     int c = rand() % 13;
  33.     if(cardnum[c] >= 4) {
  34.         return GetCard();
  35.     }
  36.     return c;
  37. }
  38.  
  39. int Loop() {
  40.     int i;
  41.     for(i = 0; i < 14; ++i) {
  42.         cardnum[GetCard()]++;
  43.     }
  44.     for(i = 0; i < 13; ++i) {
  45.         if(cardnum[i] % 2) return 0;
  46.     }
  47.     return 1;
  48. }
  49.  
  50. void ShowCards() {
  51.     int i;
  52.     for(i = 0; i < 13; ++i) {
  53.         int j;
  54.         for(j = 0; j < cardnum[i]; ++j) {
  55.             printf("%d ", i+1);
  56.         }
  57.     }
  58.     printf("\n");
  59. }
Success #stdin #stdout 4.29s 2008KB
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Standard input is empty
stdout
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0.000738
https://ideone.com/RdHRF8
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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