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A helicopter drops two trains, each on a parachute, onto a
straight infinite railway line. There is an undefined
distance between the two trains. Each faces the same
direction, and upon landing, the parachute attached to each
train falls to the ground next to the train and detaches.
Each train has a microchip that controls its motion. The
chips are identical. There is no way for the trains to know
where they are. You need to write the code in the chip to
make the trains bump into each other. Each line of code
takes a single clock cycle to execute.
You can use the following commands (and only these);
MF - moves the train forward
MB - moves the train backward
IF (P) - conditional that's satisfied if the train is next
to a parachute. There is no "then" to this IF statement.
GOTO
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Answer Posted / rshadow
Rajasekar's answer is almost correct, but:
1. i has to be increased by 1 at each iteration of the while
loop.
2. since the 2 trains are facing the same direction at the
start, using this solution will not work - the 2 trains will
always go at the same direction and will never bump into
each other. To overcome this pitfall we need to use a
statement such as 'if (P) STOP', (or: if (P) GOTO END).
notice that above I assume that the condition if (P) is only
satisfied when the train is next to the OTHER train's
parachute. Otherwise, using a counter we can check if the
train is next to its own parachute or not.
| Is This Answer Correct ? | 5 Yes | 6 No |
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