翻訳と辞書
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・ backing store
・ backoff
・ backoffice
・ backplane
・ backport
・ backronym
・ backside cache
・ backslash
・ backspace
・ backtick
backtracking
・ backup
・ backup domain controller
・ backup pumpkin
・ backup rotation
・ backup software
・ backus normal form
・ backus-naur form
・ backward analysis
・ backward chaining


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backtracking : FOLDOC
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" 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 nondeterminis
which can be used to implement nondeterminis


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