10000 leetcode/src/sudokuSolver/sudokuSolver.cpp at master · k214k/leetcode · GitHub
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Source : https://oj.leetcode.com/problems/sudoku-solver/","// Author : Hao Chen","// Date : 2014-09-20","","/********************************************************************************** ","* ","* Write a program to solve a Sudoku puzzle by filling the empty cells.","* ","* Empty cells are indicated by the character '.'.","* ","* You may assume that there will be only one unique solution.","* ","* A sudoku puzzle...","* ","* ...and its solution numbers marked in red.","* ","* ","**********************************************************************************/","","#include \u003cstdlib.h\u003e","#include \u003cstring.h\u003e","#include \u003cctype.h\u003e","#include \u003ciostream\u003e","#include \u003cvector\u003e","using namespace std;","","","const int SodukuSize = 9;","bool row_mask[SodukuSize][SodukuSize];","bool col_mask[SodukuSize][SodukuSize];","bool area_mask[SodukuSize][SodukuSize];","","bool initSudokuMask(vector\u003c vector\u003cchar\u003e \u003e \u0026board){"," //reset the memory"," memset(row_mask, false, sizeof(row_mask));"," memset(col_mask, false, sizeof(col_mask));"," memset(area_mask, false, sizeof(area_mask));",""," //check each rows and cols"," for(int r=0; r\u003cboard.size(); r++){"," for (int c=0; c\u003cboard[r].size(); c++){"," if (!isdigit(board[r][c])) {"," continue;"," };"," int idx = board[r][c] - '0' - 1;",""," //check the rows/cols/areas"," int area = (r/3) * 3 + (c/3);"," if (row_mask[r][idx] || col_mask[c][idx] || area_mask[area][idx] ){"," return false;"," }"," row_mask[r][idx] = col_mask[c][idx] = area_mask[area][idx] = true;"," }"," }"," return true;","","}","","","bool recursiveSudoKu(vector\u003c vector\u003cchar\u003e \u003e \u0026board, int row, int col){",""," if (row \u003e= SodukuSize) {"," return true;"," }",""," if (col \u003e= SodukuSize){"," return recursiveSudoKu(board, row+1, 0);"," }"," "," if (board[row][col] != '.'){"," return recursiveSudoKu(board, row, col+1); "," }"," //pick a number for empty cell"," int area;"," for(int i=0; i\u003cSodukuSize; i++){"," area = (row/3) * 3 + (col/3);"," if (row_mask[row][i] || col_mask[col][i] || area_mask[area][i] ){"," continue;"," }"," //set the number and sovle it recursively"," board[row][col] = i + '1';"," row_mask[row][i] = col_mask[col][i] = area_mask[area][i] = true;"," if (recursiveSudoKu(board, row, col+1) == true){"," return true;"," }"," //backtrace"," board[row][col] = '.';"," row_mask[row][i] = col_mask[col][i] = area_mask[area][i] = false;"," "," }"," return false;","}","","","void solveSudoku(vector\u003cvector\u003cchar\u003e \u003e \u0026board) {"," if (initSudokuMask(board) == false){"," return;"," }"," recursiveSudoKu(board, 0, 0); ","}","","","int main(int argc, char**argv) {"," return 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