c# - copy items from a list on one condition -

i trying copy items list list on 1 condition. have 3 lists. first list contains example 10 lists of points, second list contains total distance (cost or fitness) of each list (10 lists -> 10 total distances).

here picture: first list contains 10 lists (each list contains points) - second list 'fitness' third list empty , should filled items on 1 condition. first added values in second list. example numbers above: totalfitness = 4847 + 5153 + 5577 + 5324...

the condition add list of points out of first list third list is: example ----------> (fitness[0] / totalfitness) <= ratio.

but not working, here can see code tried:

class  runga  {   public static list<list<point3d>> creategenerations(list<list<point3d>> firstgeneration, list<int> firstfitness, int generationsize)   {    list<list<point3d>> currentgeneration = new list<list<point3d>>();     int totalfitness;    int actualfitness;    totalfitness = firstfitness[0] + firstfitness[1];    double ratio = 1 / 10;     for(int k = 2; k < firstfitness.count; k++)    {     actualfitness = firstfitness[k];     totalfitness += actualfitness;    }     for(int = 0; < firstfitness.count; i++)    {     double selected = firstfitness[i] / totalfitness;     if(selected < ratio)     {      currentgeneration.add(firstgeneration[i]);     }    }    return currentgeneration;   } } 

the third list still empty. if change condition to: if(selected <= ratio) whole list of points in first list being copied third list. want copy is: list of points has 'best' fitness.

what i'm doing wrong? have absolutely no clue , tried few changes, still not working. appreciate if can consider i'm beginner.

i found solution problem.

i still have these data:

list1:

1. listofpoints = a
2. listofpoints = b
3. listofpoints = c
4. listofpoints = d

list2:

1. fitness of a
2. fitness of b
3. fitness of c
4. fitness of d

what wanted achieve was: take listofpoints, has best fitness , put them list3. rest listofpoints, put them list4.

this solution thought of: put list1 keys , list2 values dictionary , sort via linq. transfer sorted keys list3. for- loop put first half of sorted list list4 , second half list5.

here code:

list<list<point3d>> currentgeneration = handoverpopulation.tolist(); list<double> currentfitness = handoverfitness.tolist(); dictionary<list<point3d>, double> dict = new dictionary<list<point3d>, double>(); foreach(list<point3d> key in currentgeneration) {   foreach(double valuee in currentfitness)   {     if(!dict.containskey(key))     {       if(!dict.containsvalue(valuee))       {dict.add(key, valuee);}     }   } } var item = pair in dict orderby pair.value ascending select pair; list<list<point3d>> currentgenerationsorted = new list<list<point3d>>(); currentgenerationsorted = item.select(kvp => kvp.key).tolist();  list<list<point3d>> newgeneration = new list<list<point3d>>(); list<list<point3d>> newgenerationextra = new list<list<point3d>>();  int p = currentgenerationsorted.count / 2; for(int = 0; < p; i++) {newgeneration.add(currentgenerationsorted[i]);}  for(int j = p; j < currentgenerationsorted.count; j++) {newgenerationextra.add(currentgenerationsorted[j]);} 

hope helps others face same problem.