diff --git a/Link_List/linklist.cpp b/Link_List/linklist.cpp new file mode 100644 index 00000000..bc945295 --- /dev/null +++ b/Link_List/linklist.cpp @@ -0,0 +1,133 @@ +// A complete working C++ program to demonstrate +// all insertion methods on Linked List +#include +using namespace std; + +// A linked list node +class Node +{ + public: + int data; + Node *next; +}; + +/* Given a reference (pointer to pointer) +to the head of a list and an int, inserts +a new node on the front of the list. */ +void push(Node** head_ref, int new_data) +{ + /* 1. allocate node */ + Node* new_node = new Node(); + + /* 2. put in the data */ + new_node->data = new_data; + + /* 3. Make next of new node as head */ + new_node->next = (*head_ref); + + /* 4. move the head to point to the new node */ + (*head_ref) = new_node; +} + +/* Given a node prev_node, insert a new node after the given +prev_node */ +void insertAfter(Node* prev_node, int new_data) +{ + /*1. check if the given prev_node is NULL */ + if (prev_node == NULL) + { + cout<<"the given previous node cannot be NULL"; + return; + } + + /* 2. allocate new node */ + Node* new_node = new Node(); + + /* 3. put in the data */ + new_node->data = new_data; + + /* 4. Make next of new node as next of prev_node */ + new_node->next = prev_node->next; + + /* 5. move the next of prev_node as new_node */ + prev_node->next = new_node; +} + +/* Given a reference (pointer to pointer) to the head +of a list and an int, appends a new node at the end */ +void append(Node** head_ref, int new_data) +{ + /* 1. allocate node */ + Node* new_node = new Node(); + + Node *last = *head_ref; /* used in step 5*/ + + /* 2. put in the data */ + new_node->data = new_data; + + /* 3. This new node is going to be + the last node, so make next of + it as NULL*/ + new_node->next = NULL; + + /* 4. If the Linked List is empty, + then make the new node as head */ + if (*head_ref == NULL) + { + *head_ref = new_node; + return; + } + + /* 5. Else traverse till the last node */ + while (last->next != NULL) + last = last->next; + + /* 6. Change the next of last node */ + last->next = new_node; + return; +} + +// This function prints contents of +// linked list starting from head +void printList(Node *node) +{ + while (node != NULL) + { + cout<<" "<data; + node = node->next; + } +} + +/* Driver code*/ +int main() +{ + /* Start with the empty list */ + Node* head = NULL; + + // Insert 6. So linked list becomes 6->NULL + append(&head, 6); + + // Insert 7 at the beginning. + // So linked list becomes 7->6->NULL + push(&head, 7); + + // Insert 1 at the beginning. + // So linked list becomes 1->7->6->NULL + push(&head, 1); + + // Insert 4 at the end. So + // linked list becomes 1->7->6->4->NULL + append(&head, 4); + + // Insert 8, after 7. So linked + // list becomes 1->7->8->6->4->NULL + insertAfter(head->next, 8); + + cout<<"Created Linked list is: "; + printList(head); + + return 0; +} + + +// This code is contributed by rathbhupendra diff --git a/Tower_Of_Hanoi/Tower Of Honoi.java b/Tower_Of_Hanoi/Tower Of Honoi.java new file mode 100644 index 00000000..17c550f6 --- /dev/null +++ b/Tower_Of_Hanoi/Tower Of Honoi.java @@ -0,0 +1,24 @@ +// Java recursive program to solve tower of hanoi puzzle + +class GFG +{ + // Java recursive function to solve tower of hanoi puzzle + static void towerOfHanoi(int n, char from_rod, char to_rod, char aux_rod) + { + if (n == 1) + { + System.out.println("Move disk 1 from rod " + from_rod + " to rod " + to_rod); + return; + } + towerOfHanoi(n-1, from_rod, aux_rod, to_rod); + System.out.println("Move disk " + n + " from rod " + from_rod + " to rod " + to_rod); + towerOfHanoi(n-1, aux_rod, to_rod, from_rod); + } + + // Driver method + public static void main(String args[]) + { + int n = 4; // Number of disks + towerOfHanoi(n, \'A\', \'C\', \'B\'); // A, B and C are names of rods + } +}