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Question 12.1.3: Simplify the procedure using the following trick. Extend the......

Simplify the procedure using the following trick. Extend the array val, adding a cell with index null. Let val [null] be t.

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val [null]  := t;
x := root ;
while t <> val [x] do begin

if t < val [x] then begin

x := left  [x];

end else begin
x := right  [x];
end ;

end ;
..answer is (x <> null).

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