8 queen problem

The eight queens problem is the problem of placing eight queens on an 8×8 chessboard such that none of them attack one another (no two are in the same row, column, or diagonal). More generally, the n queens problem places n queens on an n×n chessboard.

There are different solutions for the problem.

Backtracking | Set 3 (N Queen Problem)

Branch and Bound | Set 5 (N Queen Problem)

You can find detailed solutions at http://en.literateprograms.org/Eight_queens_puzzle_(C)