Simon Weber Csc173 Scheme Week 3-4 N-queens Problem in Scheme Backtracking with Mrv Heuristic

نویسنده

  • Simon Weber
چکیده

Algorithms: Backtracking This algorithm searches through all possible placements of queens until it finds a valid one. It starts by placing one queen in the first column and first row, then tries to place the other queens so that they do not conflict. Once there is no possible place to put a queen, it pulls the current queen off the board and tries the previous queen in its next row. The order of rows is important in the efficiency of the algorithm (this is discussed in Analysis). It will always find a solution, but it is inefficient and a weak method.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Declarative Implementations of Search Strategies for Solving CSPs in Control Network Programming

The paper describes one of the most researched techniques in solving Constraint Satisfaction Problems (CSPs) searching which is well-suited for declarative (non-procedural) implementation in a new programming paradigm named Control Network Programming, and how this can be achieved using the tools for dynamic computation control. Some heuristics for variable and value ordering in backtracking al...

متن کامل

Counting-Based Look-Ahead Schemes for Constraint Satisfaction

The paper presents a new look-ahead scheme for backtracking search for solving constraint satisfaction problems. This look-ahead scheme computes a heuristic for value ordering and domain pruning. The heuristic is based on approximating the number of solutions extending each partial solution. In particular, we investigate a recent partitionbased approximation of tree-clustering algorithms, Itera...

متن کامل

A collusion mitigation scheme for reputation systems

Reputation management systems are in wide-spread use to regulate collaborations in cooperative systems. Collusion is one of the most destructive malicious behaviors in which colluders seek to affect a reputation management system in an unfair manner. Many reputation systems are vulnerable to collusion, and some model-specific mitigation methods are proposed to combat collusion. Detection of col...

متن کامل

Eecient Local Search with Connict Minimization: a Case Study of the N-queens Problem 1

Backtracking search is frequently applied to solve a constraint-based search problem but it often suuers from exponential growth of computing time. We present an alternative to backtracking search: local search based on connict minimization. We have applied this general search framework to study a benchmark constraint-based search problem, the n-queens problem. An eecient local search algorithm...

متن کامل

A Multilevel Tabu Search with Backtracking for Exploring Weak Schur Numbers

In the field of Ramsey theory, the weak Schur number WS(k) is the largest integer n for which their exists a partition into k subsets of the integers [1, n] such that there is no x < y < z all in the same subset with x+y = z. Although studied since 1941, only the weak Schur numbersWS(1) throughWS(4) are precisely known, for k ≥ 5 theWS(k) are only bracketed within rather loose bounds. We tackle...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2009