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Description: 哲学家进餐问题是荷兰学者Dijkstra 提出的经典问题之一,它是一个信号量机制问题的应用,在操作系统文化史上具有非常重要的地位。对该问题的剖析有助于学生深刻地理解计算机系统中的资源共享、进程同步、死锁等问题,并能熟练地应用信号量来解决生活中的控制流程,即将生活中的控制流程用形式化的方式表达出来。
假设有5个哲学家，他们花费一生中的时光思考和吃饭。这些哲学家共用一个圆桌，每个哲学家都有一把椅子。在桌子中央是一碗通心面，在桌子上放着5只筷子。（如图所示）当一个哲学家思考时，他与其他同事不交互。时而，哲学家会感到饥饿，并试图拿起与他相近的两只筷子（他与邻近左、右之间的筷子）。一个哲学家一次只能拿起一只筷子。显然，他不能从其他哲学家手里拿走筷子。当一个饥饿的哲学家同时有两只筷子时，他就不能不用释放他的筷子而自己吃了。当吃完后，他会放下两只筷子，并再次开始思考。
规定奇数号哲学家先拿他左边的筷子，然后再去拿右边的筷子；而偶数号哲学家则相反。按此规定，将是1、 2号哲学家竞争1号筷子；3、4号哲学家竞争3号筷子。即五位哲学家都先竞争奇数号筷子，获得后，再去竞争偶数号筷子，最后总会有一位哲学家能获得两只筷子而进餐。
-dining philosophers problem is the Netherlands scholars Dijkstra's one of the classic, It is a signal to the mechanism of application, the operating system in the history of culture has a very important position. Analysis of the problem to help students understand deeply the computer system resource sharing, process synchronization, and other issues Deadlock, skilled and can be applied to solve the signal volume life of the control flow, about the life of the control flow with the formal expression. Assuming a five philosophers, they spend a lifetime of thought and time to eat. These philosophers sharing a round-table, each have a chair philosopher. The table is a bowl of the Central Link hearts, placed on the table five chopsticks. (As shown) as a philosopher to think that he and othe
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Description: 哲学家进餐问题是荷兰学者Dijkstra 提出的经典问题之一,它是一个信号量机制问题的应用,在操作系统文化史上具有非常重要的地位。对该问题的剖析有助于学生深刻地理解计算机系统中的资源共享、进程同步、死锁等问题,并能熟练地应用信号量来解决生活中的控制流程,即将生活中的控制流程用形式化的方式表达出来。
假设有5个哲学家，他们花费一生中的时光思考和吃饭。这些哲学家共用一个圆桌，每个哲学家都有一把椅子。在桌子中央是一碗通心面，在桌子上放着5只筷子。（如图所示）当一个哲学家思考时，他与其他同事不交互。时而，哲学家会感到饥饿，并试图拿起与他相近的两只筷子（他与邻近左、右之间的筷子）。一个哲学家一次只能拿起一只筷子。显然，他不能从其他哲学家手里拿走筷子。当一个饥饿的哲学家同时有两只筷子时，他就不能不用释放他的筷子而自己吃了。当吃完后，他会放下两只筷子，并再次开始思考。
规定奇数号哲学家先拿他左边的筷子，然后再去拿右边的筷子；而偶数号哲学家则相反。按此规定，将是1、 2号哲学家竞争1号筷子；3、4号哲学家竞争3号筷子。即五位哲学家都先竞争奇数号筷子，获得后，再去竞争偶数号筷子，最后总会有一位哲学家能获得两只筷子而进餐。
-dining philosophers problem is the Netherlands scholars Dijkstra's one of the classic, It is a signal to the mechanism of application, the operating system in the history of culture has a very important position. Analysis of the problem to help students understand deeply the computer system resource sharing, process synchronization, and other issues Deadlock, skilled and can be applied to solve the signal volume life of the control flow, about the life of the control flow with the formal expression. Assuming a five philosophers, they spend a lifetime of thought and time to eat. These philosophers sharing a round-table, each have a chair philosopher. The table is a bowl of the Central Link hearts, placed on the table five chopsticks. (As shown) as a philosopher to think that he and othe
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Author: nicmaters |
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Description: Dijkstra算法，Heap优化，复杂度NlogN-Dijkstra algorithm, Heap optimization, complexity NlogN
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Author: byron |
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Description: 哲学家进餐问题是荷兰学者Dijkstra 提出的经典问题之一,它是一个信号量机制问题的应用,在操作系统文化史上具有非常重要的地位。对该问题的剖析有助于学生深刻地理解计算机系统中的资源共享、进程同步、死锁等问题,并能熟练地应用信号量来解决生活中的控制流程,即将生活中的控制流程用形式化的方式表达出来。
假设有5个哲学家，他们花费一生中的时光思考和吃饭。这些哲学家共用一个圆桌，每个哲学家都有一把椅子。在桌子中央是一碗通心面，在桌子上放着5只筷子。（如图所示）当一个哲学家思考时，他与其他同事不交互。时而，哲学家会感到饥饿，并试图拿起与他相近的两只筷子（他与邻近左、右之间的筷子）。一个哲学家一次只能拿起一只筷子。显然，他不能从其他哲学家手里拿走筷子。当一个饥饿的哲学家同时有两只筷子时，他就不能不用释放他的筷子而自己吃了。当吃完后，他会放下两只筷子，并再次开始思考。
规定奇数号哲学家先拿他左边的筷子，然后再去拿右边的筷子；而偶数号哲学家则相反。按此规定，将是1、 2号哲学家竞争1号筷子；3、4号哲学家竞争3号筷子。即五位哲学家都先竞争奇数号筷子，获得后，再去竞争偶数号筷子，最后总会有一位哲学家能获得两只筷子而进餐。
-dining philosophers problem is the Netherlands scholars Dijkstra's one of the classic, It is a signal to the mechanism of application, the operating system in the history of culture has a very important position. Analysis of the problem to help students understand deeply the computer system resource sharing, process synchronization, and other issues Deadlock, skilled and can be applied to solve the signal volume life of the control flow, about the life of the control flow with the formal expression. Assuming a five philosophers, they spend a lifetime of thought and time to eat. These philosophers sharing a round-table, each have a chair philosopher. The table is a bowl of the Central Link hearts, placed on the table five chopsticks. (As shown) as a philosopher to think that he and othe
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Author: nicmaters |
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Description: 哲学家进餐问题是荷兰学者Dijkstra 提出的经典问题之一,它是一个信号量机制问题的应用,在操作系统文化史上具有非常重要的地位。对该问题的剖析有助于学生深刻地理解计算机系统中的资源共享、进程同步、死锁等问题,并能熟练地应用信号量来解决生活中的控制流程,即将生活中的控制流程用形式化的方式表达出来。
假设有5个哲学家，他们花费一生中的时光思考和吃饭。这些哲学家共用一个圆桌，每个哲学家都有一把椅子。在桌子中央是一碗通心面，在桌子上放着5只筷子。（如图所示）当一个哲学家思考时，他与其他同事不交互。时而，哲学家会感到饥饿，并试图拿起与他相近的两只筷子（他与邻近左、右之间的筷子）。一个哲学家一次只能拿起一只筷子。显然，他不能从其他哲学家手里拿走筷子。当一个饥饿的哲学家同时有两只筷子时，他就不能不用释放他的筷子而自己吃了。当吃完后，他会放下两只筷子，并再次开始思考。
规定奇数号哲学家先拿他左边的筷子，然后再去拿右边的筷子；而偶数号哲学家则相反。按此规定，将是1、 2号哲学家竞争1号筷子；3、4号哲学家竞争3号筷子。即五位哲学家都先竞争奇数号筷子，获得后，再去竞争偶数号筷子，最后总会有一位哲学家能获得两只筷子而进餐。
-dining philosophers problem is the Netherlands scholars Dijkstra's one of the classic, It is a signal to the mechanism of application, the operating system in the history of culture has a very important position. Analysis of the problem to help students understand deeply the computer system resource sharing, process synchronization, and other issues Deadlock, skilled and can be applied to solve the signal volume life of the control flow, about the life of the control flow with the formal expression. Assuming a five philosophers, they spend a lifetime of thought and time to eat. These philosophers sharing a round-table, each have a chair philosopher. The table is a bowl of the Central Link hearts, placed on the table five chopsticks. (As shown) as a philosopher to think that he and othe
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Author: nicmaters |
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Description: 生产者-消费者问题是一个经典的进程同步问题，该问题最早由Dijkstra提出，用以演示他提出的信号量机制。在同一个进程地址空间内执行的两个线程。生产者线程生产物品，然后将物品放置在一个空缓冲区中供消费者线程消费。消费者线程从缓冲区中获得物品，然后释放缓冲区。当生产者线程生产物品时，如果没有空缓冲区可用，那么生产者线程必须等待消费者线程释放出一个空缓冲区。当消费者线程消费物品时，如果没有满的缓冲区，那么消费者线程将被阻塞，直到新的物品被生产出来。-The producer- consumer question is a classical advancement synchronization question, this question proposed most early by Dijkstra, with demonstrates the signal quantity mechanism which he proposed.Two threads carries out which in the identical advancement address space.The producer thread production goods, then lay aside the goods in a spatial buffer supply the consumer thread expense.The consumer thread obtains the goods from the buffer, then release buffer.When producer thread production goods, if does not have the spatial buffer available, then the producer thread must wait for the consumer thread releases a spatial buffer.When consumer thread expense goods, if does not have the full buffer, then the consumer thread is blocked, is produced until the new goods.
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Author: 岳豪 |
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Description: (This is Borland C++Builder version)
The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard so was originally proposed in 1848 by the chess player Max Bezzel,
and over the years, many mathematicians, including Gauss, have worked on this puzzle and its generalized n-queens problem. The first solutions were provided by Franz Nauck in 1850.
Nauck also extended the puzzle to n-queens problem (on an n×n board—a chessboard of arbitrary size). In 1874, S. Günther proposed a method of finding solutions by using determinants, and J.W.L. Glaisher refined this approach.
Edsger Dijkstra used this problem in 1972 to illustrate the power of what he called structured programming. He published a highly detailed description of the development of a depth-first backtracking algorithm.
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Author: yout |
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Description: (This is Java version)
The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard so was originally proposed in 1848 by the chess player Max Bezzel,
and over the years, many mathematicians, including Gauss, have worked on this puzzle and its generalized n-queens problem. The first solutions were provided by Franz Nauck in 1850.
Nauck also extended the puzzle to n-queens problem (on an n×n board—a chessboard of arbitrary size). In 1874, S. Günther proposed a method of finding solutions by using determinants, and J.W.L. Glaisher refined this approach.
Edsger Dijkstra used this problem in 1972 to illustrate the power of what he called structured programming. He published a highly detailed description of the development of a depth-first backtracking algorithm.
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Author: yout |
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Description: (This is Visual Basic 6 version)
The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard so was originally proposed in 1848 by the chess player Max Bezzel,
and over the years, many mathematicians, including Gauss, have worked on this puzzle and its generalized n-queens problem. The first solutions were provided by Franz Nauck in 1850.
Nauck also extended the puzzle to n-queens problem (on an n×n board—a chessboard of arbitrary size). In 1874, S. Günther proposed a method of finding solutions by using determinants, and J.W.L. Glaisher refined this approach.
Edsger Dijkstra used this problem in 1972 to illustrate the power of what he called structured programming. He published a highly detailed description of the development of a depth-first backtracking algorithm.
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Size: 31744 |
Author: yout |
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Description: (This is VS2008 version)
The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard so was originally proposed in 1848 by the chess player Max Bezzel,
and over the years, many mathematicians, including Gauss, have worked on this puzzle and its generalized n-queens problem. The first solutions were provided by Franz Nauck in 1850.
Nauck also extended the puzzle to n-queens problem (on an n×n board—a chessboard of arbitrary size). In 1874, S. Günther proposed a method of finding solutions by using determinants, and J.W.L. Glaisher refined this approach.
Edsger Dijkstra used this problem in 1972 to illustrate the power of what he called structured programming. He published a highly detailed description of the development of a depth-first backtracking algorithm.
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Author: yout |
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Description: 三色旗的问题最早由E.W.Dijkstra所提出，他所使用的用语为Dutch Nation Flag（Dijkstra为荷兰人），而多数人会则使用Three-Color Flag来称之。
假设有一条绳子，上面有蓝、白、红三种颜色的旗子，起初绳子上的旗子颜色并没有顺序，您希望将之分类，并排列为蓝、白、红的顺序，要如何移动次数才会最少，注意您只能在绳子上进行这个动作，而且一次只能调换两个旗子。
-Tricolor problem was first raised by the EWDijkstra, the term he uses for the Dutch Nation Flag (Dijkstra is Dutch), but most people will use the Three-Color Flag to call it.
Suppose there is a rope above a blue, white and red colors of the flag, the color of the rope on the flag initially did not order, you want to classification and arrangement of blue, white and red of the order, how times before moving will be minimal, note that you can only perform this action on a rope, and one can only swap two flag.
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Author: marry |
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Description: 题最早由E.W.Dijkstra所提出，他所使用的用语为Dutch Nation Flag（Dijkstra为荷兰人），而多数人会则使用Three-Color Flag来称之。
假设有一条绳子，上面有蓝、白、红三种颜色的旗子，起初绳子上的旗子颜色并没有顺序，您希望将之分类，并排列为蓝、白、红的顺序，要如何移动次数才会最少，注意您只能在绳子上进行这个动作，而且一次只能调换两个旗子。
-Tricolor problem was first raised by the EWDijkstra, the term he uses for the Dutch Nation Flag (Dijkstra is Dutch), but most people will use the Three-Color Flag to call it.
Suppose there is a rope above a blue, white and red colors of the flag, the color of the rope on the flag initially did not order, you want to classification and arrangement of blue, white and red of the order, how times before moving will be minimal, note that you can only perform this action on a rope, and one can only swap two flag.
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Author: marry |
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Description: 最短路径问题是图论中的一个经典问题，其中的Dijkstra算法一直被认为是图论中的好算法，但有的时候需要适当的调整Dijkstra 算法才能完成多种不同的优化路径的查询。
对于某城市的公交线路，乘坐公交的顾客希望在这样的线路上实现各种优化路径的查询。设该城市的公交线路的输入格式为：
线路编号：起始站名（该站坐标）；经过的站点1 名（该站坐标）；经过的站点2名（该站坐标）；……；经过的站点n 名（该站坐标）；终点站名（该站坐标）。该线路的乘坐价钱。该线路平均经过多少时间来一辆。车速。
例如：63：A（32,45）；B（76,45）；C（76,90）；……；N（100,100）。1 元。5 分钟。1/每分钟。
假定线路的乘坐价钱与乘坐站数无关，假定不考虑公交线路在路上的交通堵塞。对这样的公交线路，需要在其上进行的优化路径查询包括：任何两个站点之间最便宜的路径；任何两个站点之间最省时间的路径等等。(he shortest path problem is a classic problem in graph theory. The Dijkstra algorithm has always been considered as a good algorithm in graph theory, but sometimes it is necessary to adjust the Dijkstra algorithm to complete a variety of different optimal path queries.)
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