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C++ Program to Perform Dictionary Operations in a Binary Search Tree
A Binary Search Tree is a sorted binary tree in which all the nodes have following two properties−
The right sub-tree of a node has a key greater than to its parent node's key.
The left sub-tree of a node has a key less than or equal to its parent node's key.
Each node should not have more than two children.
This is a C++ Program to Perform Dictionary Operations in a Binary Search Tree.
Algorithm
For insert:
Begin Declare function insert(int k) in = int(k mod max) p[in] = (n_type*) malloc(sizeof(n_type)) p[in]->d = k if (r[in] == NULL) then r[in] = p[in] r[in]->n = NULL t[in] = p[in] else t[in] = r[in] while (t[in]->n != NULL) t[in] = t[in]->n t[in]->n= p[in] End.
For search a value:
Begin Declare function search(int k) int flag = 0 in= int(k mod max) t[in] = r[in] while (t[in] != NULL) do if (t[in]->d== k) then Print “Search key is found”. flag = 1 break else t[in] = t[in]->n if (flag == 0) Print “search key not found”. End.
For Delete:
Begin Declare function delete_element(int k) in = int(k mod max) t[in] = r[in] while (t[in]->d!= k and t[in] != NULL) p[in] = t[in] t[in] = t[in]->n p[in]->n = t[in]->n Print the deleted element t[in]->d = -1 t[in] = NULL free(t[in]) End
Example
#include<iostream>
#include<stdlib.h>
using namespace std;
# define max 20
typedef struct dictionary {
int d;
struct dictionary *n;
} n_type;
n_type *p[max], *r[max], *t[max];
class Dict {
public:
int in;
Dict();
void insert(int);
void search(int);
void delete_element(int);
};
int main(int argc, char **argv) {
int v, choice, n, num;
char c;
Dict d;
do {
cout << "\n1.Create";
cout << "\n2.Search for a value";
cout<<"\n3.Delete a value";
cout << "\nEnter your choice:";
cin >> choice;
switch (choice) {
case 1:
cout << "\nEnter the number of elements to be inserted:";
cin >> n;
cout << "\nEnter the elements to be inserted:";
for (int i = 0; i < n; i++) {
cin >> num;
d.insert(num);
}
break;
case 2:
cout << "\nEnter the element to be searched:";
cin >> n;
d.search(n);
case 3:
cout << "\nEnter the element to be deleted:";
cin >> n;
d.delete_element(n);
break;
default:
cout << "\nInvalid choice....";
break;
}
cout << "\nEnter y to continue......";
cin >> c;
}
while (c == 'y');
}
Dict::Dict() {
in = -1;
for (int i = 0; i < max; i++) {
r[i] = NULL;
p[i] = NULL;
t[i] = NULL;
}
}
void Dict::insert(int k) {
in = int(k % max);
p[in] = (n_type*) malloc(sizeof(n_type));
p[in]->d = k;
if (r[in] == NULL) {
r[in] = p[in];
r[in]->n = NULL;
t[in] = p[in];
} else {
t[in] = r[in];
while (t[in]->n != NULL)
t[in] = t[in]->n;
t[in]->n= p[in];
}
}
void Dict::search(int k) {
int flag = 0;
in= int(k % max);
t[in] = r[in];
while (t[in] != NULL) {
if (t[in]->d== k) {
cout << "\nSearch key is found!!";
flag = 1;
break;
} else
t[in] = t[in]->n;
}
if (flag == 0)
cout << "\nsearch key not found.......";
}
void Dict::delete_element(int k) {
in = int(k % max);
t[in] = r[in];
while (t[in]->d!= k && t[in] != NULL) {
p[in] = t[in];
t[in] = t[in]->n;
}
p[in]->n = t[in]->n;
cout << "\n" << t[in]->d << " has been deleted.";
t[in]->d = -1;
t[in] = NULL;
free(t[in]);
}Output
1.Create 2.Search for a value 3.Delete a value Enter your choice:1 Enter the number of elements to be inserted:3 Enter the elements to be inserted:111 222 3333 Enter y to continue......y 1.Create 2.Search for a value 3.Delete a value Enter your choice:2 Enter the element to be searched:111 Search key is found!! Enter the element to be deleted:222 222 has been deleted. Enter y to continue......y 1.Create 2.Search for a value 3.Delete a value Enter your choice:222 Invalid choice.... Enter y to continue......y 1.Create 2.Search for a value 3.Delete a value Enter your choice:2 Enter the element to be searched:222 search key not found....... Enter the element to be deleted:0
Updated on: 30-Jul-2019
1K+ Views
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