Change to stack reference based

Is this possible change to Stack Reference Based??
If so , How to do it??
     private boolean solveHelper(int c, int r){
          if(r == n){
               solved = true;
               return true;
          if(c == n){
               return false;
          if(hasNoConflicts(c, r)){
               placePiece(c, r);
               boolean done = solveHelper(0, r+1);
               if(done) return true;
               else{
                    removePiece(c, r);
                    return solveHelper(c+1, r);
          else{
               return solveHelper(c+1, r);
     }

Ya..it is homework...
but we didn't taught how to unroll the recursive to
Stack, so that why i'm came up and ask!!!
So i'm beg you show me how?!You haven't been taught that?
The texts that you have do not cover it?
The teacher did not cover it?
And yet you have been assigned that homework?
Is part of the assignment supposed to be you doing your own research to find the methodology?
If the answer to the last is "no", then I suggest you drop the class and file a formal complaint with the adminstration.

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Peter Gold
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