Cleaning Robot
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Dr. Asimov, a robotics researcher, loves to research, but hates houseworks and his house were really dirty. So, he has developed a cleaning robot.
As shown in the following figure, his house has 9 rooms, where each room is identified by a letter of the alphabet:
The robot operates as follows:
- if the battery runs down, the robot stops;
- if not so, the robot chooses a direction from four cardinal...
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