82. shadowing

82/82.shadowing.md

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+```cpp
+class Solution {
+ public:
+  ListNode* deleteDuplicates(ListNode* head) {
+    ListNode dummy(0, head);
+    ListNode* prev = &dummy;
+    ListNode* curr = head;
+
+    while (curr != nullptr) {
+      if (curr->next != nullptr && curr->val == curr->next->val) {
+        int dup_val = curr->val;
+
+        while (curr != nullptr && curr->val == dup_val) {
+          curr = curr->next;
+        }
+
+        prev->next = curr;
+      } else {
+        prev = curr;
+        curr = curr->next;
+      }
+    }
+
+    return dummy.next;
+  }
+};
+
+
+```