Exhaustive Solution

// Process move m.

if ( m==moveDown ){ // fill from above

puz[rowB][colB] = puz[rowB-1][colB];

puz[rowB-1][colB] = Blank;

rowB--;

}

else if ( m==moveUp ) { // fill from below

puz[rowB][colB] = puz[rowB+1][colB];

puz[rowB+1][colB] = Blank;

rowB++;

}

else if ( m==moveRight) {// fill from left

puz[rowB][colB] = puz[rowB][colB-1];

puz[rowB][colB-1] = Blank;

colB--;

}

else {// fill from right

puz[rowB][colB] = puz[rowB][colB+1];

puz[rowB][colB+1] = Blank;

colB++;

}

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