leetcode Valid Sudoku
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原题链接:https://leetcode.com/problems/valid-sudoku/
Description
Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.
The Sudoku board could be partially filled, where empty cells are filled with the character ‘.’.
A partially filled sudoku which is valid.
Note:
A valid Sudoku board (partially filled) is not necessarily solvable. Only the filled cells need to be validated.
直接判断。。
class Solution {public: static const int N = 9; bool isValidSudoku(vector<vector<char>>& board) { for (int i = 0; i < N; i++) { for (int j = 0; j < N; j++) { if (board[i][j] == '.') continue; if (!isOk(board, i, j, board[i][j])) return false; } } return true; } bool isOk(vector<vector<char>>& board, int x,int y,char ch) { int vis[3][N + 1] = { 0 }; for (int i = 0; i < N; i++) { if (board[x][i] != '.') { vis[0][board[x][i] - '0']++; } if (board[i][y] != '.') { vis[1][board[i][y] - '0']++; } } for (int i = x / 3 * 3; i <= x / 3 * 3 + 2; i++) { for (int j = y / 3 * 3; j <= y / 3 * 3 + 2; j++) { if (board[i][j] != '.') { vis[2][board[i][j] - '0']++; } } } for (int i = 1; i <= N; i++) { if (vis[0][i] > 1 || vis[1][i] > 1 || vis[2][i] > 1) return false; } return true; }};
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