leetcode 36 有效的数独

class Solution {
public:
    bool isValidSudoku(vector<vector<char>>& board) {
        for(int i=0;i<9;i++){
            unordered_map<char,int> umRow;
            unordered_map<char,int> umCol;
            unordered_map<char,int> umSqu;
            for(int j=0;j<9;j++){
                if(board[i][j]!='.'){
                    if(umRow.find(board[i][j])!=umRow.end()){
                        return false;
                    }
                    else{
                        umRow[board[i][j]]=1;
                    }
                }
                if(board[j][i]!='.'){
                    if(umCol.find(board[j][i])!=umCol.end()){
                        return false;
                    }
                    else{
                        umCol[board[j][i]]=1;
                    }
                }
                int rowIndex=i/3*3+j/3;
                int colIndex=i%3*3+j%3;
                if(board[rowIndex][colIndex]!='.'){
                    if(umSqu.find(board[rowIndex][colIndex])!=umSqu.end()){
                        return false;
                    }
                    else{
                        umSqu[board[rowIndex][colIndex]]=1;
                    }
                }
            }
        }
        return true;
    }
};

参考：

https://blog.csdn.net/mine_song/article/details/70207326