Create ll_random_node.cpp

Author: avidLearnerInProgress

ll_random_node.cpp

@@ -0,0 +1,37 @@
+/**
+ * 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:
+    ListNode* firstNode = NULL;
+    Solution(ListNode* head) {
+        firstNode = head;
+    }
+    
+    int getRandom() {
+        int res, len = 1;
+        ListNode* current = firstNode;
+        
+        while(current) {
+            if(rand() % len == 0) {
+                res = current->val;
+            }
+            len++;
+            current = current->next;
+        }
+        return res;
+    }
+};
+
+/**
+ * Your Solution object will be instantiated and called as such:
+ * Solution* obj = new Solution(head);
+ * int param_1 = obj->getRandom();
+ */