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If you prepare students for programming contests carefully selected and widely available online training and contests offer help and diversity. If you teach about testing programs you have to know which sites offer downloadable tests or feedback with detailed test cases. If you want to make series of tasks for practicing you have to know which sites offer you categorized tasks of the appropriate level...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.