How should I practice N-Queens Solution Count?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Optimus Information onsite interview problems in FastPrep.

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N-Queens Solution Count

Optimus Information● HardINTERNONSITE INTERVIEW

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Problem statement

Place n queens on an n x n chessboard so no two attack one another. Return the number of distinct valid placements.

Function

totalNQueens(n: int) → int

Examples

Example 1

n = 4return = 2

A four-by-four board has two solutions.

Example 2

n = 1return = 1

The single square accepts one queen.

Constraints

1 <= n <= 14.

Source note: Author-written prompt excerpt retained for source fidelity.