UnionFindNode findSplitting(UnionFindNode u) throws InterruptedException { UnionFindNode result = null; UnionFindNode v = null; u.setColor(NodeColor.FIND); u.mark(); addStep("uffindstart", u.getKey()); // grey path UnionFindNode t = u; while (t.getParent() != null) { t.setGrey(true); t = t.getParent(); } pause(); // u is a representative if (u.getParent() == null) { u.setColor(NodeColor.FOUND); addStep("ufalreadyroot"); pause(); u.unmark(); return u; } v = u; UnionFindNode grandchild = null; UnionFindNode child = null; // looking for root if (v.getParent() != null) { grandchild = v; v.setColor(NodeColor.INSERT); } if (v.getParent() != null) { addStep("ufup"); pause(); v.setColor(NodeColor.FIND); v = v.getParent(); child = v; v.setColor(NodeColor.INSERT); } if (v.getParent() != null) { do { addStep("ufup"); pause(); v.setColor(NodeColor.FIND); v = v.getParent(); v.setColor(NodeColor.INSERT); grandchild.setColor(NodeColor.CACHED); addStep("ufupspecial"); pause(); grandchild.setColor(NodeColor.NORMAL); grandchild.getParent().deleteChild(grandchild); v.addChild(grandchild); UF.reposition(); grandchild.setColor(NodeColor.NORMAL); grandchild = child; child = v; } while (v.getParent() != null); } // root found if (grandchild != null) { grandchild.setColor(NodeColor.NORMAL); } if (child != null) { child.setColor(NodeColor.NORMAL); } v.setColor(NodeColor.FOUND); result = v; addStep("ufrootfound", result.getKey()); pause(); u.unmark(); result.setGrey(false); return result; }
UnionFindNode findWithCompression(UnionFindNode u) throws InterruptedException { final Stack<UnionFindNode> S = new Stack<UnionFindNode>(); UnionFindNode result = null; UnionFindNode v = null; u.setColor(NodeColor.FIND); u.mark(); addStep("uffindstart", u.getKey()); pause(); // u is a representative if (u.getParent() == null) { u.setColor(NodeColor.FOUND); addStep("ufalreadyroot"); pause(); u.unmark(); return u; } v = u; // looking for root while (v.getParent() != null) { S.add(v); // v.setColor(NodeColor.FIND); v.setGrey(true); addStep("ufup"); pause(); v = v.getParent(); } // root found result = v; v.setColor(NodeColor.FOUND); addStep("ufrootfound", result.getKey()); addStep("ufdownstart"); pause(); // don't compress a path of a son of a root if (!S.empty()) { addStep("ufdownson"); pause(); v = S.pop(); v.setColor(NodeColor.NORMAL); } while (!S.empty()) { addStep("ufdown"); v = S.pop(); // v.pointTo(result); pause(); // v.noArrow(); v.setColor(NodeColor.NORMAL); v.getParent().deleteChild(v); UF.reposition(); // pause(); result.addChild(v); UF.reposition(); // pause(); } // u.bgcolor = Colors.NORMAL; pause(); u.unmark(); result.setGrey(false); return result; }