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Program ch2;
(* *)
(* See https://theweeklychallenge.org/blog/perl-weekly-challenge-147 *)
(* *)
(* *)
(* Run as: fpc -och-2.out ch-2.p; ./ch-2.out *)
(* *)
uses
fgl;
var
pentagon: specialize TFPGMap <longint, boolean>;
n, p, seen, i: longint;
done: boolean;
begin
pentagon := specialize TFPGMap <longint, boolean> . Create;
p := 0;
n := 0;
done := false;
while not done do begin
p := p + n + n + n + 1;
n := n + 1;
pentagon . Add (p, true);
for i := 0 to pentagon . count - 1 do begin
seen := pentagon . Keys [i];
if (seen + seen <= p) and
(pentagon . IndexOf (p - seen) >= 0) and
(pentagon . IndexOf (p - seen - seen) >= 0) then begin
writeln (seen, ' ', p - seen);
done := true;
end;
if done then begin
break;
end;
end
end
end.
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