Algorithm
Unam
biguous instructions for
solving a problem or
subproblem in a finite
amount of time using a
finite amount of data
6.1
Problem Solving
147
Applying These Strategies
Now let’s apply these strategies (called
heuristics
) to a specific problem:
How do we get to the party next Saturday at Sally’s house?
Questions
: Where is Sally’s house? Where are we coming from? What is
the weather like (or likely to be like)? Will we be walking? Driving a car?
Taking a bus? Once these questions have been answered, you can begin to
plan the solution.
If it is raining, the car is in the shop, and the busses have stopped, the
best solution might be to call a taxi and give the driver Sally’s address.
If we are driving, we look at a map and see that Sally’s address is six
blocks west of the building where we work, so the first part of the solution
might be to repeat what we do each morning to get to work (providing we
are leaving from home). The next part would be to turn west and go six
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 Fall '10
 MARIANAKANT
 Sally, How to Solve It, Sally’s house, Algorithm Unambiguous instructions

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