9 lines
364 B
ObjectPascal
9 lines
364 B
ObjectPascal
// 100 doors. Nigel Galloway: January 1th., 2023
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type doorState=(Open,Closed);
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function flip(n:doorState):doorState:=if n=Open then Closed else Open;
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var Doors:Array of doorState:=ArrFill(100,Closed);
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begin
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for var n:=1 to 100 do for var g:=n-1 to 99 step n do Doors[g]:=flip(Doors[g]);
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for var n:=0 to 99 do if Doors[n]=Open then write(n+1,' '); writeLn
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end.
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