Added Algorithm for Merging Two Sorted List in C++

MergeTwoSortedList.cpp

@@ -0,0 +1,95 @@
+#include <iostream>
+using namespace std;
+
+// Define a node for the linked list
+struct Node {
+    int data;
+    Node* next;
+
+    Node(int val) {
+        data = val;
+        next = nullptr;
+    }
+};
+
+// Function to insert a new node at the end of the list
+void insertAtEnd(Node*& head, int val) {
+    Node* newNode = new Node(val);
+    if (head == nullptr) {  // if list is empty
+        head = newNode;
+        return;
+    }
+    Node* temp = head;
+    while (temp->next != nullptr) {
+        temp = temp->next;
+    }
+    temp->next = newNode;
+}
+
+// Function to print the linked list
+void printList(Node* head) {
+    while (head != nullptr) {
+        cout << head->data << " ";
+        head = head->next;
+    }
+    cout << endl;
+}
+
+// Function to merge two sorted linked lists
+Node* mergeTwoSortedLists(Node* l1, Node* l2) {
+    // If any list is empty, return the other
+    if (!l1) return l2;
+    if (!l2) return l1;
+
+    // Create a dummy node to simplify handling of the head
+    Node* dummy = new Node(-1);
+    Node* tail = dummy;
+
+    // Traverse both lists and pick smaller elements
+    while (l1 && l2) {
+        if (l1->data <= l2->data) {
+            tail->next = l1;
+            l1 = l1->next;
+        } else {
+            tail->next = l2;
+            l2 = l2->next;
+        }
+        tail = tail->next;
+    }
+
+    // If any nodes remain in one list, connect them
+    if (l1) tail->next = l1;
+    if (l2) tail->next = l2;
+
+    // Return merged list (skip dummy)
+    return dummy->next;
+}
+
+int main() {
+    Node* list1 = nullptr;
+    Node* list2 = nullptr;
+
+    int n1, n2, val;
+
+    cout << "Enter number of elements in first sorted list: ";
+    cin >> n1;
+    cout << "Enter elements of first sorted list: ";
+    for (int i = 0; i < n1; i++) {
+        cin >> val;
+        insertAtEnd(list1, val);
+    }
+
+    cout << "Enter number of elements in second sorted list: ";
+    cin >> n2;
+    cout << "Enter elements of second sorted list: ";
+    for (int i = 0; i < n2; i++) {
+        cin >> val;
+        insertAtEnd(list2, val);
+    }
+
+    cout << "\nMerged Sorted List: ";
+    Node* mergedList = mergeTwoSortedLists(list1, list2);
+    printList(mergedList);
+
+    return 0;
+}