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program Ch2;
{$mode objfpc}
uses
SysUtils,Math,Generics.Collections;
function SumSquares(N:Integer):Integer;
begin
Result := 0;
while N <> 0 do
begin
Result := Result + Trunc(Power((N mod 10),2));
n := N div 10;
end;
end;
function IsHappy(N:Integer):Boolean;
type
TMap = specialize THashMap<Integer,Integer>;
var
Value:Integer;
Map:TMap;
begin
Map := TMap.Create;
while True do
begin
Map.Add(N, 1);
N := SumSquares(N);
if(N = 1) then
begin
Result := True;
break;
end;
Map.TryGetValue(N,Value);
if(Value <> 0) then
begin
Result := False;
break;
end;
end;
FreeAndNil(Map);
end;
procedure HappyNumbers;
var
I,Count:Integer;
begin
I := 0;
Count := 0;
while Count < 8 do
begin
if IsHappy(I) then
begin
Write(I, ' ');
Inc(Count);
end;
Inc(I);
end;
end;
begin
HappyNumbers;
end.
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