Create 1290. Convert Binary Number in a Linked List to Integer (#840)

Author: Chayandas07

1290. Convert Binary Number in a Linked List to Integer

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+/**
+ * Definition for singly-linked list.
+ * struct ListNode {
+ *     int val;
+ *     ListNode *next;
+ *     ListNode() : val(0), next(nullptr) {}
+ *     ListNode(int x) : val(x), next(nullptr) {}
+ *     ListNode(int x, ListNode *next) : val(x), next(next) {}
+ * };
+ */
+class Solution {
+public:
+    int getDecimalValue(ListNode* head) {
+        int result = 0;  // Initialize result to store decimal value
+        
+        // Traverse the linked list from head to tail
+        while (head != nullptr) {
+            // Shift result left by 1 bit (multiply by 2) and add current bit
+            result = result * 2 + head->val;
+            
+            // Move to the next node
+            head = head->next;
+        }
+        
+        return result;  // Return the final decimal value
+    }
+};