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037. Sudoku Solver.cpp
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037. Sudoku Solver.cpp
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class Solution {
public:
void solveSudoku(vector<vector<char>>& board) {
solve(board);
}
private:
bool solve(vector<vector<char>>& board){
for(int i = 0; i<9; i++){
for(int j = 0; j<9; j++){
if(board[i][j]=='.'){
for(char c = '1'; c<='9'; c++){
if(valid(board, i, j, c)){
board[i][j] = c;
if(solve(board)) return true;
board[i][j] ='.';
}
}
return false;
}
}
}
return true;
}
bool valid(vector<vector<char>>& board, int row, int col, char c){
for(int i = 0; i<9; i++){
if(board[i][col]==c) return false;
if(board[row][i]==c) return false;
if(board[3*(row/3)+i/3][3*(col/3)+i%3]==c) return false;
}
return true;
}
};