RedBlack_tree_in_c

redblack.c

@@ -0,0 +1,283 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+
+struct node 
+{
+	struct node* sup; 
+	struct node* rightc;
+	struct node* leftc;
+	int value; 
+	int colour; 
+
+};
+
+
+struct node* roote = NULL;
+
+void inorder(struct node* move)
+{
+	if (move == NULL)
+	{
+		return;
+	}
+	inorder(move->leftc);
+
+	printf("                                  VALUE-%02d and ", move->value);
+	if(move->colour==1)
+	{
+		printf("COLOUR-RED\n");
+	}
+	if(move->colour==0)
+	{
+		printf("COLOUR-BLACK\n");
+	}
+
+	inorder(move->rightc);
+}
+
+void preorder(struct node* move)
+{
+	if (move == NULL)
+	{
+		return;
+	}
+
+	printf("                                  VALUE-%02d and ", move->value);
+	if(move->colour==1)
+	{
+		printf("COLOUR-RED\n");
+	}
+	if(move->colour==0)
+	{
+		printf("COLOUR-BLACK\n");
+	}
+
+	preorder(move->leftc);
+
+
+
+	preorder(move->rightc);
+}
+
+void postorder(struct node* move)
+{
+	if (move == NULL)
+	{
+		return;
+	}
+	postorder(move->leftc);
+
+	postorder(move->rightc);
+
+	printf("                                  VALUE-%02d and ", move->value);
+	if(move->colour==1)
+	{
+		printf("COLOUR-RED\n");
+	}
+	if(move->colour==0)
+	{
+		printf("COLOUR-BLACK\n");
+	}
+}
+
+
+
+struct node* redbt(struct node* move,struct node* nno)
+{
+	if (move == NULL)
+	{
+		return nno;
+	}
+
+    if (nno->value < move->value)
+	{
+		move->leftc = redbt(move->leftc, nno);
+		move->leftc->sup = move;
+	}
+
+	else if (nno->value > move->value)
+	{
+		move->rightc = redbt(move->rightc, nno);
+		move->rightc->sup = move;
+	}
+
+	return move;
+}
+
+void rightroe(struct node* temp)
+{
+	struct node* left = temp->leftc;
+    temp->leftc = left->rightc;
+
+	if (temp->leftc)
+	{
+		temp->leftc->sup = temp;
+	}
+
+	left->sup = temp->sup;
+
+	if (!temp->sup)
+	{
+		roote = left;
+	}
+
+	else if (temp == temp->sup->leftc)
+	{
+		temp->sup->leftc = left;
+	}
+
+	else
+	{
+		temp->sup->rightc = left;
+	}
+
+	left->rightc = temp;
+	temp->sup = left;
+}
+
+void leftroe(struct node* temp)
+{
+	struct node* right = temp->rightc;
+	temp->rightc = right->leftc;
+
+	if (temp->rightc)
+	{
+		temp->rightc->sup = temp;
+	}
+
+	right->sup = temp->sup;
+
+	if (!temp->sup)
+	{
+		roote = right;
+	}
+	else if (temp == temp->sup->leftc)
+	{
+		temp->sup->leftc = right;
+	}
+	else
+	{
+		temp->sup->rightc = right;
+	}
+
+	right->leftc = temp;
+	temp->sup = right;
+}
+
+void trick(struct node* root, struct node* link)
+{
+	struct node* ppt = NULL;
+	struct node* gpp = NULL;
+
+	while ((link != root) && (link->colour != 0)&& (link->sup->colour == 1))
+	{
+		ppt = link->sup;
+		gpp = link->sup->sup;
+
+		if (ppt == gpp->leftc)
+		{
+
+			struct node* ut = gpp->rightc;
+
+			if (ut != NULL && ut->colour == 1)
+			{
+				gpp->colour = 1;
+				ppt->colour = 0;
+				ut->colour = 0;
+				link = gpp;
+			}
+
+			else
+			{
+
+
+				if (link == ppt->rightc) 
+				{
+					leftroe(ppt);
+					link = ppt;
+					ppt = link->sup;
+				}
+
+
+				rightroe(gpp);
+				int t = ppt->colour;
+				ppt->colour = gpp->colour;
+				gpp->colour = t;
+				link = ppt;
+			}
+		}
+
+
+		else 
+		{
+			struct node* utt = gpp->leftc;
+
+
+			if ((utt != NULL) && (utt->colour == 1))
+			{
+				gpp->colour = 1;
+				ppt->colour = 0;
+				utt->colour = 0;
+				link =gpp;
+			}
+			else 
+			{
+
+				if (link == ppt->leftc) 
+				{
+					rightroe(ppt);
+					link = ppt;
+					ppt = link->sup;
+				}
+
+
+				leftroe(gpp);
+				int t = ppt->colour;
+				ppt->colour = gpp->colour;
+				gpp->colour = t;
+				link = ppt;
+			}
+		}
+	}
+
+	root->colour = 0;
+}
+
+
+
+
+int main()
+{
+	int n = 6;
+	int a[6] = { 41,38,31,12,19,8};
+
+	for (int i = 0; i < n; i++) {
+
+
+		struct node* temp = (struct node*)malloc(sizeof(struct node));
+		temp->rightc = NULL;
+		temp->leftc = NULL;
+		temp->sup = NULL;
+		temp->value = a[i];
+		temp->colour = 1;
+
+
+		roote = redbt(roote, temp);
+
+
+		trick(roote, temp);
+	}
+
+    printf("                                preorder Traversal of Created Tree\n");
+
+    preorder(roote);
+	printf("\n\n");
+	printf("                                Inorder Traversal of Created Tree\n");
+	inorder(roote);
+	printf("\n\n");
+	printf("                                postorder Traversal of Created Tree\n");
+    postorder(roote);
+
+	return 0;
+}