【LeetCode 36_哈希表】Valid Sudoku

 1 //occupyed_1检查行是否占用
 2 //occupyed_2检查列是否占用
 3 //occupyed_3检查块是否占用
 4 bool isValidSudoku(vector<vector<char>>& board)
 5 {
 6     int occupyed_1[9][9], occupyed_2[9][9], occupyed_3[9][9];
 7     for (int i = 0; i < 9; ++i) {
 8         for (int j = 0; j < 9; ++j) {
 9             occupyed_1[i][j] = 0;
10             occupyed_2[i][j] = 0;
11             occupyed_3[i][j] = 0;
12         }
13     }
14 
15     int rowSize = board.size();
16     int colSize = board[0].size();
17     for (int i = 0; i < rowSize; ++i) {
18         for (int j = 0; j < colSize; ++j) {
19             if (board[i][j] != '.') {
20                 int num = board[i][j] - '0' - 1;
21                 int k = i / 3 * 3 + j / 3;
22 
23                 if (occupyed_1[i][num] || occupyed_2[j][num]
24                     || occupyed_3[k][num])
25                     return false;
26                 occupyed_1[i][num] = 1;
27                 occupyed_2[j][num] = 1;
28                 occupyed_3[k][num] = 1;
29             }
30         }
31     }
32     return true;
33 }