51Set<String>blockLookup,52Set<String>visited){53if(!(x>=0&&x<row&&y>=0&&y<col)){54returnfalse;55}5657String index=x+","+y;58if(visited.contains(index)){59returnfalse;60}61if(blockLookup.contains(index)){62returnfalse;63}6465returntrue;66}6768privateSet<String>indexBlockedMatrixToSet...