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# Assign1 - Code Sudoku.cs using using using using using...

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Code Sudoku.cs using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; namespace SudokuSolver { class Sudoku { public Sudoku() { for ( int i = 0; i < 4; i++) //initially every element has a 0 value for ( int j = 0; j < 4; j++) { matrix[i, j] = 0; } } //The isValueValid method checks whether a cell can be set to a certain value. //It takes as arguments the row and column of the sudoku-matrix and the integer //value to be checked. public bool isValueValid( int row, int col, int value) { int startCol, startRow; for ( int i = 0; i < 4; i++) if (matrix[i, col] == value) return false ; //check for same value in column for ( int i = 0; i < 4; i++) if (matrix[row, i] == value) return false ; //check for same value in row startCol = col - col % 2; startRow = row - row % 2; for ( int i = 0; i < 2; i++) for ( int j = 0; j < 2; j++) if (matrix[startRow + i, startCol + j] == value) return false ; //check inside the minigrid return true ; } //The possibleValues method returns the possible values for a cell. //It checks the value of the other cells in the same row, column and minigrid. public string possibleValues( int row, int col) { 1

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string posVal = "1234" ; //used to store the possible values for a cell int startCol, startRow; string buffer; int pos; for ( int i = 0; i < 4; i++) //check within a column for unassigned values if (matrix[i, col] != 0) { buffer = matrix[i, col].ToString(); //convert number to string pos = posVal.IndexOf(buffer); if (pos > -1 && pos < 4) //if a value from 1 to 4 is already assigned posVal = posVal.Remove(pos, 1); //remove it from the possible values of a cell } for ( int i = 0; i < 4; i++) //check within a row for unassigned values if (matrix[row, i] != 0) { buffer = matrix[row, i].ToString(); pos = posVal.IndexOf(buffer); if (pos > -1 && pos < 4) posVal = posVal.Remove(pos, 1); } startCol = col - col % 2; startRow = row - row % 2; for ( int i = 0; i < 2; i++) //check within a minigrid for unassigned values for ( int j = 0; j < 2; j++) if (matrix[startRow + i, startCol + j] != 0) { buffer = matrix[startRow + i, startCol + j].ToString(); pos = posVal.IndexOf(buffer); if (pos > -1 && pos < 4) posVal = posVal.Remove(pos, 1); } return posVal; } //The method isSolved checks whether the values entered for each cell are valid public bool isSolved() { string posVal; string buffer; int pos; for ( int row = 0; row < 4; row++) { //check by row posVal = "1234" ; for ( int col = 0; col < 4; col++) { buffer = matrix[row, col].ToString(); pos = posVal.IndexOf(buffer); 2
if (pos > -1 && pos < 4) //if a value from 1 to 4 is already assigned posVal = posVal.Remove(pos, 1); //remove it from the possible values of a cell } if (posVal.Length > 0)

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