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By: a guest on Oct 11th, 2012  |  syntax: C  |  size: 1.19 KB  |  views: 28  |  expires: Never
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  1.  
  2. #include <stdlib.h>
  3. #include <time.h>
  4. #include <stdio.h>
  5. #include <math.h>
  6.  
  7. int f1(){
  8.     return rand()%4; // 1/4 chance
  9. }
  10.  
  11. int f2(){
  12.     return rand()%50; // 1/50 chance
  13. }
  14.  
  15.  
  16. int f3(){
  17.     return rand()%100; // 1/100 chance
  18. }
  19.  
  20. int main(){
  21.    
  22.     double total[3] = {0.0},maxucb,newucb;
  23.     int tried[3] = {0};
  24.     int triedf = 0;
  25.     int i,j,n,maxind;
  26.         srand(time(NULL));
  27.     int  (*f[3])() = {f1,f2,f3};
  28.    
  29.     for(j=0;j<3;j++){  
  30.       if(f[j]() == 0) total[j]+=1;
  31.       tried[j]++;
  32.       triedf++;
  33.     }
  34.    
  35.    
  36.     for(i=0;i<10000;i++){
  37.         maxucb = total[0]/triedf + sqrt((2*(log(triedf)))/tried[0]);
  38.         maxind = 0;            
  39.         for(n=1;n<3;n++){  
  40.  
  41.             newucb = total[n]/tried[n] + sqrt((2*(log(triedf)))/tried[n]);          
  42.             if(newucb > maxucb){
  43.                 maxucb = newucb;
  44.                 maxind = n;
  45.             }
  46.         }
  47.         if(f[maxind]() == 0) total[maxind]+=1;;
  48.         triedf++;
  49.         tried[maxind]++;
  50.     }
  51.    
  52.     for(n=0;n<3;n++){  
  53.       printf("win percentage: %f tries: %d\n",total[n]/tried[n],tried[n]);
  54.     }
  55.        
  56.     system("pause");
  57.  
  58.    
  59.     return 0;
  60.    
  61. }
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