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public class kenkensolver
{
public static boolean done = false;
public static void main(String args[])
{
Solver s = new Solver("3x3_1.txt");
s.printPuzzle();
KStack stack = new KStack();
//int[][] implied = s.implyByRows();
solve(s,stack);
System.out.println();
s.printPuzzle();
}
public static void solve(Solver s, KStack k)
{
System.out.println("Attempting to solve:");
s.printArray(s.puzzle);
System.out.println("Stack is:");
s.printArray(k.toArray());
if(s.isSolved())
{
System.out.println("Done!");
done = true;
return;
}
else
{
int[][] rows = s.implyByRows();
if(rows.length > 0)
{
//System.out.println("Implying by rows because imply returned ");
//s.printArray(rows);
for(int[] i : rows)
{
k.push(i);
}
solve(s,k);
return;
}
else
{
int[][] cols = s.implyByCols();
if(cols.length > 0)
{
for(int[] i : cols)
{
k.push(i);
}
solve(s,k);
return;
}
else
{
int[][] cage = s.implyByCages();
if(cage.length > 0)
{
for(int[] i : cage)
{
k.push(i);
}
solve(s,k);
return;
}
else
{//We have implyed by rows, cols, and cages, now we just have to guess.
//Fist, find the first(from top left) spot in the puzzle that's still 0
int lastx = -1;
int lasty = -1;
search:
for(int x = 0; x < s.size; x++)
{
for(int y = 0; y < s.size;y++)
{
if(s.puzzle[x][y] == 0)
{
lastx = x;
lasty = y;
System.out.println("Attempting to guess number for (" + x + "," + y + ")");
break search;
}
}
}
boolean[] possibilities = s.getPossibilities(lastx,lasty);
int numpossible = 0;
for(boolean b : possibilities)
{
if(b)
numpossible++;
}
if(numpossible > 0)
{
int[] guess = new int[4];
for(int i = 0; i < possibilities.length && !done; i++)
{
System.out.println("Unable to imply a solution for (" + lastx + "," + lasty + ") guessing:");
s.printArray(possibilities);
if(possibilities[i])
{
if(i == possibilities.length-1)
{
guess[0] = 0;
}
else
{
guess[0] = 1;
}
guess[1] = lastx;
guess[2] = lasty;
guess[3] = i+1;
k.push(guess);
s.put(lastx,lasty,i+1);
solve(s,k);
}
}
}
else
{
//We have exhusted all possibilities for this square
System.out.println("\nExhausted possibilities.. backtracking\n");
while(k.getLength() > 0 && k.peek()[0] == 0 && !done) //While implied stuff is still on top
{
int[] thisitem = k.pop();
System.out.println("Removeing:");
s.printArray(thisitem);
s.remove(thisitem[1],thisitem[2]);
}
//And pop the last guess
int[] lastguess = k.pop();
System.out.println("Removeing:");
s.printArray(lastguess);
s.remove(lastguess[1],lastguess[2]);
System.out.println("Done backtracking");
return;
}
}
}
}
}
//System.out.println("Something has gone horribly wrong!");
}
}
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