[LeetCode]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.

思考：参考这里。

class Solution {

public:

    bool isValidSudoku(vector<vector<char> > &board) {

        vector<vector<bool> > rows(9,vector<bool>(9,false));

        vector<vector<bool> > cols(9,vector<bool>(9,false));

        vector<vector<bool> > blocks(9,vector<bool>(9,false));

        for(int i=0;i<9;i++)

        {

            for(int j=0;j<9;j++)

            {

                if(board[i][j]=='.') continue;

                int c=board[i][j]-'1';

                if(rows[i][c]||cols[j][c]||blocks[i-i%3+j/3][c]) return false;

                rows[i][c]=cols[j][c]=blocks[i-i%3+j/3][c]=true;

            }

        }

        return true;

    }

};