# SUDOKU.cpp

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#include <iostream> #include <cstdio> #include <cstring> #include <cstdlib> using namespace std; #define UNASSIGNED 0 #define N 9 bool FindUnassignedLocation(int grid[N][N], int &row, int &col); bool isSafe(int grid[N][N], int row, int col, int num); /* assign values to all unassigned locations for Sudoku solution */ bool SolveSudoku(int grid[N][N]) { int row, col; if (!FindUnassignedLocation(grid, row, col)) return true; for (int num = 1; num <= 9; num++) { if (isSafe(grid, row, col, num)) { grid[row][col] = num; if (SolveSudoku(grid)) return true; grid[row][col] = UNASSIGNED; } } return false; } /* Searches the grid to find an entry that is still unassigned. */ bool FindUnassignedLocation(int grid[N][N], int &row, int &col) { for (row = 0; row < N; row++) for (col = 0; col < N; col++) if (grid[row][col] == UNASSIGNED) return true; return false; } /* Returns whether any assigned entry n the specified row matches the given number. */ bool UsedInRow(int grid[N][N], int row, int num) { for (int col = 0; col < N; col++) if (grid[row][col] == num) return true; return false; } /* Returns whether any assigned entry in the specified column matches the given number. */ bool UsedInCol(int grid[N][N], int col, int num) { for (int row = 0; row < N; row++) if (grid[row][col] == num)

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