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Author: Partho Biswas

README.md

@@ -258,7 +258,7 @@ I have solved quite a number of problems from several topics. See the below tabl
 |19| **[23. Merge k Sorted Lists](https://tinyurl.com/u4dpc7r)** | [Python](https://tinyurl.com/wu6rdaw/23_Merge_k_Sorted_Lists.py)| **[educative.io](https://tinyurl.com/vaetc9d), [Art 1](https://tinyurl.com/rybqon6)** | Hard | Very important. TODO: Check heap approach |
 |20| [160. Intersection of Two Linked Lists](https://tinyurl.com/rz6nrop)| [Python](https://tinyurl.com/wu6rdaw/160_Intersection_of_Tw_Linked_Lists.py)| [Art 1](https://tinyurl.com/urrs7uy), [Art 2](https://tinyurl.com/wkya7ks) | Easy | --- |
 |21| **[138. Copy List with Random Pointer](https://tinyurl.com/uhaw95f)** | [Python](https://tinyurl.com/wu6rdaw/138_Copy_List_with_Random_Pointer.py)| **[Vid 1](https://tinyurl.com/reaqam9), [Art 1](https://tinyurl.com/tnwofvs)** | Medium | **TODO: Check again. Very important. Learned a lot of things** |
-|22| **[430. Flatten a Multilevel Doubly Linked List](https://tinyurl.com/sgpamoh)** | [Python](https://tinyurl.com/wu6rdaw/430_Flatten_a_Multilevel_Doubly_Linked_List.py)| [codinginterviewclass.com](https://tinyurl.com/wtmsrqa), **[Vid 1](https://tinyurl.com/tbp99p2), [Art 1](https://tinyurl.com/un8p7f2)** | Medium | **TODO: Check again. Very important. Learned a lot of things** |
+|22| **[430. Flatten a Multilevel Doubly Linked List](https://tinyurl.com/sgpamoh)** | [Python](https://tinyurl.com/wu6rdaw/430_Flatten_a_Multilevel_Doubly_Linked_List.py)| [backtobackswe.com](https://tinyurl.com/y9mptlro), **[Vid 1](https://tinyurl.com/tbp99p2), [Art 1](https://tinyurl.com/un8p7f2)** | Medium | **TODO: Check again. Very important. Learned a lot of things** |
 |23| **[146. LRU Cache](https://tinyurl.com/zu2qbfl)** | [Python](https://tinyurl.com/wu6rdaw/146_LRU_Cache.py)| **[Vid 1](https://tinyurl.com/rtnhhys), [backtobackswe.com](https://tinyurl.com/vbpvjdc), [algoexpert.io](https://tinyurl.com/t2uhpgn)** | Medium | **TODO: Check again. Very important. Learned a lot of things** |