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Backtracking - Dictionary Definition and Overview |
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Backtracking :
A scheme for solving a series of sub-problems each
of which may have multiple possible solutions and where the
solution chosen for one sub-problem may affect the possible
solutions of later sub-problems.
To solve the overall problem, we find a solution to the first
sub-problem and then attempt to recursively solve the other
sub-problems based on this first solution. If we cannot, or
we want all possible solutions, we backtrack and try the next
possible solution to the first sub-problem and so on.
Backtracking terminates when there are no more solutions to
the first sub-problem.
This is the algorithm used by logic programming languages
such as Prolog to find all possible ways of proving a
goal.__An_optimisation_known_as_"{intelligent_backtracking">goal. An optimisation known as "{intelligent backtracking"
keeps track of the dependencies between sub-problems and only
re-solves those which depend on an earlier solution which has
changed.
Backtracking is one algorithm which can be used to implement
nondeterminism. It is effectively a depth-first search of
a problem space.
(1995-04-13)
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Example Usage of Backtracking |
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bluejayrock: That beeping sounds is me Backtracking on my Texas declaration |
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missruthsuzanne: Backtracking, i loved the merlin finale. i was just a bit bummed that arthur didn't catch merlin in the act. & by that i mean doing magic ;) |
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soccerskatie: @ShaoLao And I'm not Backtracking! |
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