[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;
}
};