leetcode——36——Valid Sudoku

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.

class Solution {
public:
    bool isValidSudoku(vector<vector<char>>& board) {
        int i, j, c;
        int row[9][9], col[9][9], block[3][3][9];
        memset(row, 0, sizeof(row));
        memset(col, 0, sizeof(col));
        memset(block, 0, sizeof(block));
        for (i = 0; i < 9; i++) {
            for (j = 0; j < 9; j++) {
                if(board[i][j] != '.'){
                    c = board[i][j] - '1';
                    if (row[i][c] || col[c][j] || block[i / 3][j / 3][c])
                        return false;
                    else {
                        row[i][c] ++;
                        col[c][j] ++;
                        block[i / 3][j / 3][c]++;
                    }
                }
            }
        }
        return true;

    }
};