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program Ch2;
{$mode objfpc}
uses
SysUtils,Types;
type
TFunc = function(N:Integer):Boolean;
function All(F:TFunc;Arr:TIntegerDynArray):Boolean;
var
I:Integer;
begin
for I := Low(Arr) to High(Arr) do
if not(F(Arr[I])) then Exit(False);
Exit(True);
end;
function MostFrequentEven(Arr:TIntegerDynArray):Integer;
var
I,MaxKey:Integer;
Counts:array[0..9] of Integer;
begin
if(All(@Odd,Arr)) then Exit(-1);
FillDWord(Counts,Length(Counts),0);
for I := Low(Arr) to High(Arr) do
if not Odd(Arr[I]) then Inc(Counts[Arr[I]]);
MaxKey := Counts[0];
for I := 1 to High(Counts) do
if Counts[I] > MaxKey then MaxKey := I;
Exit(MaxKey);
end;
begin
WriteLn(MostFrequentEven([1,1,2,6,2]));
WriteLn(MostFrequentEven([1,3,5,7]));
WriteLn(MostFrequentEven([6,4,4,6,1]));
end.
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