/**
* @param {character[][]} board
* @return {boolean}
*/
var isValidSudoku = function(board) {
for(let i = 0; i < 9; ++i){
let set = new Set();
for(let j = 0; j < 9; ++j){
if(board[i][j] === '.'){
continue;
}
if(set.has(board[i][j])){
return false;
}
set.add(board[i][j]);
}
}
for(let j = 0; j < 9; ++j){
let set = new Set();
for(let i = 0; i < 9; ++i){
if(board[i][j] === '.'){
continue;
}
if(set.has(board[i][j])){
return false;
}
set.add(board[i][j]);
}
}
for(let i = 0; i < 3; ++i){
for(let j = 0; j < 3; ++j){
let set = new Set();
for(let p = 0; p < 3; ++p){
for(let q = 0; q < 3; ++q){
let obj = board[i * 3 + p][j * 3 + q];
if(obj === '.'){
continue;
}
if(set.has(obj)){
return false;
}
set.add(obj);
}
}
}
}
return true;
};
