validate sudoku leetcode To solve a Sudoku puzzle, one must look for cells where only one number is possible, or rows/columns/blocks where a specific number has only one possible placement.
This technique is called "single candidate." Use Pencil Marks Pencil marks can be a lifesaver when solving Sudoku puzzles. validate sudoku leetcodesudoku and solution Step 5: Apply the "Swordfish" Technique Similar to the "X-Wing," the "Swordfish" technique is used when three rows or columns have three cells that can only contain the same three numbers.
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