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Topic: Backtracking Problem / Level: beginner
Problem:
Generate all possible letter combinations from a phone number, where each digit corresponds to a set of letters. Return the combinations.
More Problems
Solve the Sudoku problem for a 4x4 grid. Ensure the solution meets all standard Sudoku rules regarding numbers and their placement.
Find all combinations of a given array where the elements sum to a specific target value. Include all unique combinations in the output.
Print all unique subsets of a set that contains duplicate elements. Ensure no duplicate subsets are printed in the final result.
Solve the Knights Tour problem for a 5x5 chessboard. Determine a valid sequence of moves for the knight covering all squares.
Find all unique palindromic partitions of a given string. Each substring must be a palindrome, and no duplicates should appear.
Generate all combinations of a given string, ensuring that combinations of various lengths are included and printed in the output.
Find all valid placements of 3 non-attacking rooks on a 3x3 chessboard. Ensure no two rooks threaten each other in the solution.
Generate all subsets of an array with duplicate elements, ensuring that the subsets returned do not contain any duplicates.
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