Create 3217. Delete Nodes From Linked List Present in Array 1 (#923)

Author: Chayandas07

3217. Delete Nodes From Linked List Present in Array 1

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+class Solution {
+public:
+    ListNode* modifiedList(vector<int>& nums, ListNode* head) {
+        unordered_set<int> s(nums.begin(), nums.end());
+        vector<int> vec;
+        ListNode* curr = head;
+
+        while (curr) {
+            if (s.count(curr->val) == 0) vec.push_back(curr->val);
+            curr = curr->next;
+        }
+
+        if (vec.empty()) return nullptr;
+
+        curr = head;
+        ListNode* prev = nullptr;
+        for (int v : vec) {
+            curr->val = v;
+            prev = curr;
+            curr = curr->next;
+        }
+
+        if (prev) prev->next = nullptr;
+        return head;
+    }
+};