What Is Queen Problem in Data Structure?


Heather Bennett

The Queen Problem is a classic puzzle in the field of data structures and algorithms. It is a challenging problem that involves placing queens on a chessboard in such a way that no two queens threaten each other. In this article, we will explore the Queen Problem and discuss various approaches to solve it.

Understanding the Queen Problem

In chess, the queen is one of the most powerful pieces on the board. It can move any number of squares horizontally, vertically, or diagonally. The objective of the Queen Problem is to place a certain number of queens on an n x n chessboard in such a way that no two queens can attack each other.

This means that no two queens should be placed in the same row, column, or diagonal. If two queens are placed in such a way that they can attack each other, it is called a conflict. The goal is to find all possible configurations of queen placements on the board without conflicts.

Solving the Queen Problem

There are several approaches to solve the Queen Problem. One common approach is to use backtracking. Backtracking involves trying out different configurations and undoing them if they lead to conflicts.

Backtracking Algorithm

Here’s a step-by-step algorithm for solving the Queen Problem using backtracking:

  1. Create an empty chessboard of size n x n.
  2. Start with the first column and iterate through each row.
    • If it is safe to place a queen at the current position (no conflicts with previously placed queens), mark it as occupied.
    • Move to the next column and recursively repeat steps 2-3 until all columns are processed.
    • If all queens are successfully placed, add the current configuration to the list of solutions.
    • If a conflict is encountered at any step, undo the placement of the previous queen and try the next row in the current column.
  3. Once all possible configurations have been explored, return the list of solutions.

By following this algorithm, we can find all possible configurations of queen placements without conflicts. It is important to note that the time complexity of this algorithm is exponential, as it explores all possible combinations.


The Queen Problem is a fascinating puzzle that challenges our ability to think critically and solve complex problems. By using backtracking or other techniques, we can find all possible configurations of queen placements on a chessboard without conflicts. This problem has applications in various areas such as computer chess algorithms and constraint satisfaction problems.

By understanding and practicing solving the Queen Problem, you can enhance your problem-solving skills and improve your understanding of data structures and algorithms.

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