3,000,000 Queens in less than one minute
Rok Sosič, Jun Hua Gu · ACM SIGART Bulletin · 1991
The n - queens problem is a classical combinatorial search problem. In this paper we give a linear time algorithm for this problem. The algorithm is an extension of one of our previous local search algorithms [3, 4, 6]. On an IBM RS 6000 computer, this algorithm is capable of solving problems with 3,000,000 queens in approximately 55 seconds.