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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
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102
Task/Knapsack-problem-Continuous/Ada/knapsack-problem-continuous.ada
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with Ada.Text_IO;
with Ada.Float_Text_IO;
with Ada.Strings.Unbounded;
procedure Knapsack_Continuous is
package US renames Ada.Strings.Unbounded;
type Item is record
Name : US.Unbounded_String;
Weight : Float;
Value : Positive;
Taken : Float;
end record;
function "<" (Left, Right : Item) return Boolean is
begin
return Float (Left.Value) / Left.Weight <
Float (Right.Value) / Right.Weight;
end "<";
type Item_Array is array (Positive range <>) of Item;
function Total_Weight (Items : Item_Array) return Float is
Sum : Float := 0.0;
begin
for I in Items'Range loop
Sum := Sum + Items (I).Taken;
end loop;
return Sum;
end Total_Weight;
function Total_Value (Items : Item_Array) return Float is
Sum : Float := 0.0;
begin
for I in Items'Range loop
Sum := Sum + Float (Items (I).Value) / Items(I).Weight * Items (I).Taken;
end loop;
return Sum;
end Total_Value;
procedure Solve_Knapsack_Continuous
(Items : in out Item_Array;
Weight_Limit : Float)
is
begin
-- order items by value per weight unit
Sorting : declare
An_Item : Item;
J : Natural;
begin
for I in Items'First + 1 .. Items'Last loop
An_Item := Items (I);
J := I - 1;
while J in Items'Range and then Items (J) < An_Item loop
Items (J + 1) := Items (J);
J := J - 1;
end loop;
Items (J + 1) := An_Item;
end loop;
end Sorting;
declare
Rest : Float := Weight_Limit;
begin
for I in Items'Range loop
if Items (I).Weight <= Rest then
Items (I).Taken := Items (I).Weight;
else
Items (I).Taken := Rest;
end if;
Rest := Rest - Items (I).Taken;
exit when Rest <= 0.0;
end loop;
end;
end Solve_Knapsack_Continuous;
All_Items : Item_Array :=
((US.To_Unbounded_String ("beef"), 3.8, 36, 0.0),
(US.To_Unbounded_String ("pork"), 5.4, 43, 0.0),
(US.To_Unbounded_String ("ham"), 3.6, 90, 0.0),
(US.To_Unbounded_String ("greaves"), 2.4, 45, 0.0),
(US.To_Unbounded_String ("flitch"), 4.0, 30, 0.0),
(US.To_Unbounded_String ("brawn"), 2.5, 56, 0.0),
(US.To_Unbounded_String ("welt"), 3.7, 67, 0.0),
(US.To_Unbounded_String ("salami"), 3.0, 95, 0.0),
(US.To_Unbounded_String ("sausage"), 5.9, 98, 0.0));
begin
Solve_Knapsack_Continuous (All_Items, 15.0);
Ada.Text_IO.Put ("Total Weight: ");
Ada.Float_Text_IO.Put (Total_Weight (All_Items), 0, 2, 0);
Ada.Text_IO.New_Line;
Ada.Text_IO.Put ("Total Value: ");
Ada.Float_Text_IO.Put (Total_Value (All_Items), 0, 2, 0);
Ada.Text_IO.New_Line;
Ada.Text_IO.Put_Line ("Items:");
for I in All_Items'Range loop
if All_Items (I).Taken > 0.0 then
Ada.Text_IO.Put (" ");
Ada.Float_Text_IO.Put (All_Items (I).Taken, 0, 2, 0);
Ada.Text_IO.Put_Line (" of " & US.To_String (All_Items (I).Name));
end if;
end loop;
end Knapsack_Continuous;