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[size=18px]var s,n:integer;
begin
write('ÊäÈë±ä³¤µÄÌõÊýn');
readln(n);
[color=#FF0000]s:=n*(n-1)*(n-2)div 6; //±¾ÐÐÌæ»»Îªs:=n*(n-1)*(n-2)/ 6;Ôõô²»ÐУ¿£¿£¿[/color]
writeln('×é³ÉµÄÈý½ÇÐθöÊý',s);
readln;[/size]
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if Node.ChildNodes <> nil then
begin
for i := 0 to Node.ChildNodes.Count - 1 do
begin
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