N Queens Problem Program plan: Filename: “PartialSolution.java” This code snippet creates a class “PartialSolution”. In the code, Define a class “PartialSolution”. Declare the class variables. Define the constructor “PartialSolution”. Set “boardSize” equal to “n”. Define the array “queens”. Define the method “examine()”. Iterate a “for” loop, Iterate the inner “for” loop, If “queens[i]” attacks “queens[j]”. Return the value of “ABANDON”. If the length of the “queens” is “boardSize”, Return the value of “ACCEPT”. Else, Return the value of “CONTINUE”. Define the method “extend()”. Set the value of “result”. Iterate a “for” loop, Get the length of “queens” to “size”. Set the “result[i]”. Iterate a “for” loop, Set “queen[j]” to “result[i]”. Append the new queen to “ith” column. Return the value of “result”. Define a method “toString()”. Return the queens. Filename: “Queen.java” This code snippet creates a class “Queen”. In the code, Define a class “Queen”. Define the class members “row” and “column”. Define a constructor “Queen()”. Set the value of “row” and “column”. Define the method “attacks()”. Return the result of logical operation. Define a method “toString()”. Return the value. Filename: “NQueens.java” This code snippet creates a class “NQueens”. In the code, Import the required packages. Define a class “NQueens”. Define the “main” method. Prompt the user to enter the number. Define the object of class “Scanner”. Scan for the input. If the value of “n” is greater than or equal to 0, Call the method “solve()”. Define the method “solve()”. Define the variable “exam”. If the value of “exam” equal to “ACCEPT”, Print the value of “sol”. Else if, the value of “exam” is “ABANDON”, Iterate a “for” loop, Call the method “solve()”.

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Chapter 13, Problem 25PE

Program Plan Intro

N Queens Problem

Program plan:

Filename: “PartialSolution.java”

This code snippet creates a class “PartialSolution”. In the code,

Define a class “PartialSolution”.

Declare the class variables.

Define the constructor “PartialSolution”.

Set “boardSize” equal to “n”.

Define the array “queens”.

Define the method “examine()”.

Iterate a “for” loop,

Iterate the inner “for” loop,

If “queens[i]” attacks “queens[j]”.

Return the value of “ABANDON”.

If the length of the “queens” is “boardSize”,

Return the value of “ACCEPT”.

Else,

Return the value of “CONTINUE”.

Define the method “extend()”.

Set the value of “result”.

Iterate a “for” loop,

Get the length of “queens” to “size”.

Set the “result[i]”.

Iterate a “for” loop,

Set “queen[j]” to “result[i]”.

Append the new queen to “ith” column.

Return the value of “result”.

Define a method “toString()”.

Return the queens.

Filename: “Queen.java”

This code snippet creates a class “Queen”. In the code,

Define a class “Queen”.

Define the class members “row” and “column”.

Define a constructor “Queen()”.

Set the value of “row” and “column”.

Define the method “attacks()”.

Return the result of logical operation.

Define a method “toString()”.

Return the value.

Filename: “NQueens.java”

This code snippet creates a class “NQueens”. In the code,

Import the required packages.

Define a class “NQueens”.

Define the “main” method.

Prompt the user to enter the number.

Define the object of class “Scanner”.

Scan for the input.

If the value of “n” is greater than or equal to 0,

Call the method “solve()”.

Define the method “solve()”.

Define the variable “exam”.

If the value of “exam” equal to “ACCEPT”,

Print the value of “sol”.

Else if, the value of “exam” is “ABANDON”,

Iterate a “for” loop,

Call the method “solve()”.

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