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Tuppu Feb 20th, 2015 205 Never
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  1. // another quite typical sorting algorithm implementated in this function,
  2. // you know it
  3. void Datastructure::quickSort(std::vector<Person>& A, unsigned int p,
  4.     unsigned int q)
  5. {
  6.     unsigned int r;
  7.  
  8.     if(p < q)
  9.     {
  10.         r = partition(A, p,q);
  11.         quickSort(A,p,r);  
  12.         quickSort(A,r+1,q);
  13.     }
  14. }
  15.  
  16. unsigned int Datastructure::partition(std::vector<Person>& A,
  17.     unsigned int p, unsigned int q)
  18. {
  19.     // i integeter can be randomized, but trying to did it made me tweaking.
  20.     // I got problem with two mixed conditions, randomizing i wasnt trivial
  21.     unsigned int i = p;
  22.     unsigned int j;
  23.  
  24.     // at()-functions decreases ~3 percentages 84 % -> 81 %, but safer.
  25.     // enlistingYear is the primary to sort, when it is have a same value
  26.     // then birthYear matters, can be called as older person, when he(or she?)
  27.     // has born earlier (smaller value in birthYear).
  28.     for(j=p+1; j<q; j++)
  29.     {
  30.         if(A.at(j).enlistingYear > A.at(p).enlistingYear ||
  31.          (A.at(j).birthYear >= A.at(p).birthYear && A.at(j).enlistingYear ==
  32.          A.at(p).enlistingYear))
  33.         {
  34.             i++;
  35.  
  36.             swap(&A.at(i),&A.at(j));
  37.         }
  38.     }
  39.  
  40.     swap(&A.at(i),&A.at(p));
  41.  
  42.     return i;
  43. }
  44.  
  45. void Datastructure::swap(Person *x, Person *y)
  46. {
  47.     // Person structure, using pointing Person and referensing temp to y
  48.     // made the program and me crazy
  49.     temp = *x;
  50.     *x = *y;
  51.     *y = temp;
  52. }
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