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网站后台上传文章,b站视频推广的方法有哪些,wordpress投稿图片,北京今天出现什么情况了有效的数独 题目: 请你判断一个 9 x 9 的数独是否有效。只需要 根据以下规则 ,验证已经填入的数字是否有效即可。数字 1-9 在每一行只能出现一次。 数字 1-9 在每一列只能出现一次。 数字 1-9 在每一个以粗实线分隔的 3x3 宫内只能出现一次。示例 1: 输…

有效的数独

题目:

请你判断一个 9 x 9 的数独是否有效。只需要 根据以下规则 ,验证已经填入的数字是否有效即可。数字 1-9 在每一行只能出现一次。
数字 1-9 在每一列只能出现一次。
数字 1-9 在每一个以粗实线分隔的 3x3 宫内只能出现一次。示例 1:
输入: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"]]
输出:true示例 2:
输入:board = 
[["8","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"]]
输出:false
解释:除了第一行的第一个数字从 5 改为 8 以外,空格内其他数字均与 示例1 相同。 但由于位于左上角的 3x3 宫内有两个 8 存在, 因此这个数独是无效的。

解题思路: 分别创建三个数组对行, 列, 3 x 3 方格的数字进行校验即可

class Solution {public boolean isValidSudoku(char[][] board) {boolean[][] row = new boolean[9][9];boolean[][] col = new boolean[9][9];boolean[][] block = new boolean[9][9];for(int i = 0; i < 9; i++) {for(int j = 0; j < 9; j++) {char c = board[i][j];if(c == '.') {continue ;}int idx = (int) (c - '1');if(row[i][idx]) {return false;}if(col[j][idx]) {return false;}int rowIdx = i / 3 * 3;int colIdx = j / 3;if(block[rowIdx + colIdx][idx]) {return false;}row[i][idx] = true;col[j][idx] = true;block[rowIdx + colIdx][idx] = true;}}return true;}
}

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