Added solutions

Author: avidLearnerInProgress

convert_ll_to_binary_number.cpp

@@ -0,0 +1,22 @@
+/**
+ * Definition for singly-linked list.
+ * struct ListNode {
+ *     int val;
+ *     ListNode *next;
+ *     ListNode(int x) : val(x), next(NULL) {}
+ * };
+ */
+class Solution {
+public:
+    int getDecimalValue(ListNode* head) {
+        
+        int res=0;
+        while(head!=NULL) {
+            res*=2;
+            if(head->val==1) res++;
+            head=head->next;
+        }
+        return res;
+        
+    }
+};