题目：

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.

思路：

简单地检查行、列、方形是否有数字重复。

代码：

class Solution {
public:
    bool num[3][9][9];
    bool isValidSudoku(vector<vector<char>> &board) {
        for(int i=0;i<3;i++)
        {
            for(int j=0;j<9;j++)
            {
                for(int k=0;k<9;k++)
                {
                    num[i][j][k]=true;
                }
            }
        }
        for(int i=0;i<9;i++)
        {
            for(int j=0;j<9;j++)
            {
                if(isInteger(board[i][j]))
                {
                    if(!num[0][i][board[i][j]-'1'])
                    {
                        return false;
                    }
                    else
                    {
                        num[0][i][board[i][j]-'1'] = false;
                    }
                    if(!num[1][j][board[i][j]-'1'])
                    {
                        return false;
                    }
                    else
                    {
                        num[1][j][board[i][j]-'1'] = false;
                    }
                    if(!num[2][i/3*3+j/3][board[i][j]-'1'])
                    {
                        return false;
                    }
                    else
                    {
                        num[2][i/3*3+j/3][board[i][j]-'1'] = false;
                    }
                }
            }
        }
        return true;
    }
};