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class Solution {
public:
bool isValidSudoku(vector<vector<char>>& board) {
// brust way
int a[9][9];
for(int i=0;i<9;i++) {
for(int j=0;j<9;j++) {
a[i][j] = board[i][j] == '.' ? - 1 : board[i][j] - '0';
}
}
int b[10][10], c[10][10];
int d[3][3][10];
for(int i=0;i<10;i++) {
for(int j=0;j<10;j++) {
b[i][j] = 0;
c[i][j] = 0;
}
}
for(int i=0;i<3;i++) {
for(int j=0;j<3;j++) {
for(int k=0;k<10;k++) {
d[i][j][k] = 0;
}
}
}
for(int i=0;i<9;i++) {
for(int j=0;j<9;j++) {
if(a[i][j] != -1) {
b[i][a[i][j]]++;
if(b[i][a[i][j]] > 1) return false;
c[j][a[i][j]]++;
if(c[j][a[i][j]] > 1) return false;
d[i/3][j/3][a[i][j]]++;
if(d[i/3][j/3][a[i][j]] > 1) return false;
}
}
}
return true;
}
};
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