Initial Commit

C/Sudoku/sudoku.cpp

@@ -0,0 +1,169 @@
+ 
+/**
+ * sudoku.cpp
+ * 
+ * This program will be used to solve sudoku puzzles
+ * 
+ * @date oct, 25, 2011
+ * @author ricky barrette
+ */
+
+#include <iostream>
+#include "sudoku.h"
+
+int mPuzzle[PUZZLE_SIZE][PUZZLE_SIZE] = {	{6,0,0, 8,3,0, 0,4,0},
+						{0,8,5, 1,0,0, 0,0,0},
+						{0,0,0, 0,0,0, 0,0,0},
+		    
+						{4,0,0, 0,6,0, 0,8,0},
+						{0,0,0, 0,0,8, 0,0,3},
+						{1,6,0, 0,0,2, 0,0,0},
+					    
+						{0,0,9, 0,0,3, 0,1,0},
+						{0,5,0, 6,0,0, 0,0,0},
+						{0,1,0, 0,4,0, 2,9,0}	};
+
+int mCount = 0;
+
+/**
+ * Main function
+ */
+int main(){
+  std::cout << "\nHello World, Sudoku!\n\n\n";
+  
+  printPuzzle(mPuzzle);
+  
+  if(solve(mPuzzle) == 0) {
+    std::cout << "NO SOLUTION\n";
+    std::cout << mCount;
+   std::cout << " trys\n\n";
+  } else {
+   std::cout << "\nSolved in ";
+   std::cout << mCount;
+   std::cout << " trys\n\n";
+   
+   printPuzzle(mPuzzle);
+  }
+  return 1;
+}
+
+/**
+ * Checks the Row
+ * @returns 1 if legal, 0 if illegal
+ * @author ricky barrette
+ */
+int checkRow(int n, int r, int puzzle[PUZZLE_SIZE][PUZZLE_SIZE]){
+  for(int index = 0; index < PUZZLE_SIZE; index++)
+      if(n == puzzle[r][index])
+	return 0;
+   return 1;
+}
+
+/**
+ * Checks the  Column
+ * @returns 1 if legal, 0 if illegal
+ * @author ricky barrette
+ */
+int checkColumn(int n, int c, int puzzle[PUZZLE_SIZE][PUZZLE_SIZE]){
+  for(int index = 0; index < PUZZLE_SIZE; index++)
+      if(n == puzzle[index][c])
+	return 0;
+   return 1;
+}
+
+/**
+ * Checks the "Box"
+ * @returns 1 if legal, 0 if illegal
+ * @author ricky barrette
+ */
+int checkBox(int n, int r, int c, int puzzle[PUZZLE_SIZE][PUZZLE_SIZE]){
+  r = (r/BOX_SIZE)*BOX_SIZE;
+  c = (c/BOX_SIZE)*BOX_SIZE;
+  
+  for(int ri = 0; ri < BOX_SIZE; ri++)
+    for(int ci = 0; ci < BOX_SIZE; ci++)
+	if(n == puzzle[r+ri][c+ci])
+	  return 0;
+  
+  //no violations
+  return 1;
+}
+
+/**
+ * Solves a sudoku puzzle
+ * @returns 1 if solvable, 0 if not
+ * @author ricky barrette
+ */
+int solve(int puzzle[PUZZLE_SIZE][PUZZLE_SIZE]){
+  return solve(0,0, puzzle);
+}
+
+/**
+ * Solves a sudoku puzzle
+ * @returns 1 if solvable, 0 if not
+ * @author ricky barrette
+ */
+int solve(int r, int c, int puzzle[PUZZLE_SIZE][PUZZLE_SIZE]){
+  
+  if(DEBUG){
+    sleep(1);
+    printPuzzle(puzzle);
+  }
+  
+  mCount++;
+   
+  if (r == PUZZLE_SIZE) {
+    r = 0;
+    if (++c == PUZZLE_SIZE)
+      return 1;
+  }
+  //skip filled cells
+  if (puzzle[r][c] != 0)
+    return solve(r+1,c,puzzle);
+
+  for (int n = 1; n <= PUZZLE_SIZE; n++) {
+    if (legal(n,r,c,puzzle) == 1) {
+      puzzle[r][c] = n;
+      if (solve(r+1,c,puzzle) == 1)
+	return 1;
+    }
+  }
+  //reset on backtrack
+  puzzle[r][c] = 0;
+  return 0;
+}
+
+/**
+ * Prints the puzzle onto the screen
+ * @author ricky barrette
+ */
+void printPuzzle(int puzzle[PUZZLE_SIZE][PUZZLE_SIZE]){
+  
+  for(int ri = 0; ri < PUZZLE_SIZE; ri++){
+    for(int ci = 0; ci < PUZZLE_SIZE; ci++){ 
+      std::cout << puzzle[ri][ci];
+      //format: break for groups of BOX_SIZE
+      if(ci % BOX_SIZE == 2)
+	std::cout <<"  ";
+    }
+    //format: break columns of BOX_SIZE
+    if(ri % BOX_SIZE == 2)
+	std::cout <<"\n";
+    //format: break for new row
+    std::cout << "\n";
+  }
+  std::cout <<"\n-------------\n";
+}
+
+/**
+ * Checks the puzzle if it is legal
+ * @returns 1 if legal; 0 if not
+ * @author ricky barrette
+ */
+int legal(int n, int r, int c, int puzzle[PUZZLE_SIZE][PUZZLE_SIZE]){
+  if(checkRow(n, r, puzzle) == 1)
+    if(checkColumn(n, c, puzzle) == 1)
+      if(checkBox(n, r, c, puzzle) == 1)
+	return 1;
+  return 0;
+}