diff --git a/147.Insertion Sort List.cpp b/147.Insertion Sort List.cpp
index cd185e4..1b3c94d 100644
--- a/147.Insertion Sort List.cpp	
+++ b/147.Insertion Sort List.cpp	
@@ -19,3 +19,53 @@ class Solution {
         return dummy->next;
     }
 };
+
+https://www.programiz.com/cpp-programming/online-compiler/
+// Online C++ compiler to run C++ program online
+#include <iostream>
+
+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* insertionSortList(ListNode* head) {
+        if(head == NULL || head->next == NULL ) return head;
+        ListNode *dummy = new ListNode(0), *cur = head;
+        // dummy->next=head;
+        while(cur){
+            std::cout << "out:: " << cur->val<< std::endl;
+            ListNode *prev = dummy, *next = cur->next;
+            while(prev->next && prev->next->val<=cur->val){
+                std::cout << "in:: " << prev->next->val<< std::endl;
+                // 0,4,2,5
+                prev = prev->next;
+            }
+            cur->next = prev->next;
+            prev->next=cur;
+            std::cout << "last:: " << prev->next->val<< std::endl;
+            cur = next;
+        }
+        return dummy->next;
+    }
+};
+
+
+int main() {
+    // Write C++ code here
+    // std::cout << "Try programiz.pro";
+    Solution s= Solution();
+    // [4,2,1,3]
+    ListNode *a = new ListNode(4);
+    ListNode *b = new ListNode(2);
+    a->next = b;
+    ListNode *c =s.insertionSortList(a);
+    std::cout << "res: "<<c->val;
+    return 0;
+}