# Get TLE in sudoku solver problem

• l thought the code blew is fine, but lt get tle problem,could someone help me out? thanks

void solveSudoku(vector<vector<char> > &board){
solve(board);
}
bool solve(vector<vector<char> > &board) {
int rsize=board.size();
if(rsize<=0)    return false;
int csize=board[0].size();
for(int i=0;i<rsize;i++){
for(int j=0;j<csize;j++){
if(board[i][j]!='.'){
continue;
}
for(int k=1;k<=9;k++){
board[i][j] = (char)('0'+k);
if(isValid(board,i,j) && solve(board)){
return true;
}
board[i][j]='.';
}
return false;
}
}
return true;
}

bool isValid(vector<vector<char> > &board,int a,int b){
unordered_set<char> uset;
for(int i=0;i<9;i++){
if(board[a][i]=='.')    continue;
if(uset.find(board[a][i])!=uset.end())  return false;
else uset.insert(board[a][i]);
}
uset.clear();
for(int i=0;i<9;i++){
if(board[i][b]=='.')    continue;
if(uset.find(board[i][b])!=uset.end())  return false;
else uset.insert(board[i][b]);
}
uset.clear();
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
int x=a/3*3+i;
int y=b/3*3+j;
if(board[x][y]=='.')    continue;
if(uset.find(board[x][y])!=uset.end())  return false;
else uset.insert(board[x][y]);
}
}
return true;
}

Looks like your connection to LeetCode Discuss was lost, please wait while we try to reconnect.