The N Queens Problem
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http://www.apl.jhu.edu/~hall/java/NQueens.html  


Marty Hall  
Finding a solution to the NQueens problem for any N greater than or equal to 4 can be done without searching. Determining where each queen should go can be done in constant time per queen, or O(N) altogether. Thus, drawing the board (which is O(N^2)) is the rate limiting step. This is demonstrated by a Java applet that lets you select an N from 4 to 60, using an algorithm from the ACM SIGART Bulletin.  


Levels:  College 
Languages:  English 
Resource Types:  Problems/Puzzles, Web Interactive/Java 
Math Topics:  Combinatorics 
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