mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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178 lines
19 KiB
JSON
178 lines
19 KiB
JSON
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"title": "Sudoku Solver",
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"content": "<p>Write a program to solve a Sudoku puzzle by filling the empty cells.</p>\n\n<p>A sudoku solution must satisfy <strong>all of the following rules</strong>:</p>\n\n<ol>\n\t<li>Each of the digits <code>1-9</code> must occur exactly once in each row.</li>\n\t<li>Each of the digits <code>1-9</code> must occur exactly once in each column.</li>\n\t<li>Each of the digits <code>1-9</code> must occur exactly once in each of the 9 <code>3x3</code> sub-boxes of the grid.</li>\n</ol>\n\n<p>The <code>'.'</code> character indicates empty cells.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img src=\"https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Sudoku-by-L2G-20050714.svg/250px-Sudoku-by-L2G-20050714.svg.png\" style=\"height:250px; width:250px\" />\n<pre>\n<strong>Input:</strong> board = [["5","3",".",".","7",".",".",".","."],["6",".",".","1","9","5",".",".","."],[".","9","8",".",".",".",".","6","."],["8",".",".",".","6",".",".",".","3"],["4",".",".","8",".","3",".",".","1"],["7",".",".",".","2",".",".",".","6"],[".","6",".",".",".",".","2","8","."],[".",".",".","4","1","9",".",".","5"],[".",".",".",".","8",".",".","7","9"]]\n<strong>Output:</strong> [["5","3","4","6","7","8","9","1","2"],["6","7","2","1","9","5","3","4","8"],["1","9","8","3","4","2","5","6","7"],["8","5","9","7","6","1","4","2","3"],["4","2","6","8","5","3","7","9","1"],["7","1","3","9","2","4","8","5","6"],["9","6","1","5","3","7","2","8","4"],["2","8","7","4","1","9","6","3","5"],["3","4","5","2","8","6","1","7","9"]]\n<strong>Explanation:</strong> The input board is shown above and the only valid solution is shown below:\n\n<img src=\"https://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Sudoku-by-L2G-20050714_solution.svg/250px-Sudoku-by-L2G-20050714_solution.svg.png\" style=\"height:250px; width:250px\" />\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>board.length == 9</code></li>\n\t<li><code>board[i].length == 9</code></li>\n\t<li><code>board[i][j]</code> is a digit or <code>'.'</code>.</li>\n\t<li>It is <strong>guaranteed</strong> that the input board has only one solution.</li>\n</ul>\n",
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