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BST.c

@@ -0,0 +1,217 @@
+#include<stdio.h>
+#include<conio.h>
+
+struct node{
+    int key;
+    struct node *left,*right;
+};
+
+struct stack{
+    int top;
+    int s[100];
+};
+
+struct node *minx(struct node *root){
+    struct node *x=root;
+    while(x->left->left!=NULL){
+        x=x->left;
+    }
+    return x;
+}
+
+struct node *newNode(int key){
+    struct node *temp=(struct node *)malloc(sizeof(struct node));
+    temp->key=key;
+    temp->left=NULL;
+    temp->right=NULL;
+    return temp;
+
+}
+
+struct node *insert(struct node *root,int key)
+{
+
+    struct node *x=root,*y=root;
+    if(root==NULL){
+        root=newNode(key);
+    }
+    else{
+
+    while(x!=NULL){
+        if(key<=(x->key)){
+            y=x;
+             x=x->left;
+        }
+        else if (key>(x->key)){
+          y=x;
+          x=x->right;
+        }
+
+    }
+    x=newNode(key);
+    if(key>(y->key)) {
+        y->right=x;
+    }
+    else{
+        y->left=x;
+    }
+    }
+
+    return root;
+
+
+}
+
+struct node *search(struct node *root,int key){
+    struct node *x=root;
+    struct node *y=NULL;
+    while(x!=NULL){
+        if(x->key==key){
+          y=x;
+          break;
+
+        } else if (x->key < key) x=x->right;
+        else x=x->left;
+    }
+    return y;
+
+};
+
+struct node *deletenode(struct node *root,int key){
+    struct node *x=root,*y=NULL;
+
+    while(x!=NULL){
+        if(key>(x->key)){
+            y=x;
+            x=x->right;
+
+        }
+        else if(key<(x->key)){
+            y=x;
+            x=x->left;
+
+        }
+        else{
+            break;
+        }
+    }
+    if(x==NULL){
+        printf("Key not found to delete");
+        return root;
+    }
+    if((x->right==NULL) && (x->left==NULL)){
+
+        if(y==NULL)                {    root=NULL;   }
+        else if(y->right!=NULL && key==y->right->key){ y->right=NULL;  }
+        else if(y->left!=NULL && key==y->left->key) {  y->left=NULL;  }
+        free(x);
+        return root;
+    }
+    else if(x->right==NULL){
+        if(y==NULL) {root=root->left;}
+        else if(y->right!=NULL && key==y->right->key){ y->right=x->left; }
+        else if(y->left!=NULL && key==y->left->key){ y->left=x->left;}
+        return root;
+    }
+    else if(x->left==NULL){
+        if(y==NULL)  {root=root->right;}
+        else if(y->right!=NULL && key==y->right->key ){ y->right=x->right;}
+        else if(y->left!=NULL && key==y->left->key){y->left=x->right;}
+        return root;
+    }
+    else{
+        if(x->right->left!=NULL){
+            struct node *minimum=minx(x->right);
+            x->key=minimum->left->key;
+            minimum->left=NULL;
+            }
+            else{
+                x->key=x->right->key;
+                x->right=x->right->right;
+            }
+
+    }
+    return root;
+
+
+}
+struct node *pop(struct stack *st,struct node *root){
+    int key=(*st).s[(*st).top];
+
+    struct node *x=search(root,key);
+    (*st).top--;
+    return x;
+};
+
+
+void inorder(struct node *root){
+
+    struct node *current=root;
+
+    struct stack st;
+    st.top=-1;
+    while(1){
+        if(current!=NULL){
+            st.top++;
+            st.s[st.top]=current->key;
+            current=current->left;}
+        else{
+            if(st.top!=-1){
+                current=pop(&st,root);
+                printf("%d\n",current->key);
+                current=current->right;
+                            }
+            else{
+                break;
+            }
+        }
+    }
+
+}
+
+int main()
+{
+    struct node *root=NULL;
+    int choice,key;
+    do{
+        printf("Enter your choice:\n1.Insert\n2.Delete\n3.Search\n4.Inorder Traversal\n5.Exit\n");
+        scanf("%d",&choice);
+
+        switch(choice){
+            case 1:
+
+                printf("Enter the element to add to the tree\n");
+                scanf("%d",&key);
+                root=insert(root,key);
+                printf("Item inserted\n");
+
+                break;
+            case 2:
+                printf("Enter element to be deleted from the tree\n");
+                scanf("%d",&key);
+                root=deletenode(root,key);
+
+                break;
+            case 3:
+                printf("Enter element to search in tree\n");
+                scanf("%d",&key);
+                struct node *y=search(root,key);
+                if(y!=NULL) printf("Found in the tree\n");
+                else printf("Not Found\n");
+                break;
+            case 4:
+                inorder(root);
+                break;
+            case 5:
+                break;
+            default:
+                printf("Sorry the entered integer is not correct\n");
+                break;
+
+
+
+        }
+    }while(choice<=4 && choice>=1);
+
+    return 0;
+}

timeanalysis.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include <sys/time.h>
+#include <stdio.h>
+using namespace std;
+
+void sleep(int delay){
+    for(int i=1; i<=delay; i++)
+        for(int j=1; j<=delay; j++)
+            (i*j)%2;
+}
+
+float timedifference_msec(struct timeval t0, struct timeval t1){
+    return (t1.tv_sec - t0.tv_sec) * 1000.0f + (t1.tv_usec - t0.tv_usec) / 1000.0f;
+}
+
+int main(void){
+   struct timeval t0;
+   struct timeval t1;
+   float elapsed;
+
+   gettimeofday(&t0, 0);
+   sleep(300);
+   gettimeofday(&t1, 0);
+
+   elapsed = timedifference_msec(t0, t1);
+
+   printf("Code executed in %f milliseconds.\n", elapsed);
+
+   return 0;
+}