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472 problems in this topic

# Title Topics Acceptance Pts Difficulty
151 Valid Anagram 20 Easy Solve
152 Walls and Gates 30 Medium Solve
153 Add Two Numbers 30 Medium Solve
154 Alien Dictionary 40 Hard Solve
155 Design Add and Search Words Data Structure 30 Medium Solve
156 Kth Smallest Element in a BST 30 Medium Solve
157 Kth Smallest Element in a BST 30 Medium Solve
158 Missing Number 20 Easy Solve
159 Sliding Window Maximum 40 Hard Solve
160 Valid Parentheses 20 Easy Solve
161 Word Search II 40 Hard Solve
162 Add Two Numbers 30 Medium Solve
163 Alien Dictionary 40 Hard Solve
164 Alien Dictionary 40 Hard Solve
165 Contains Duplicate 20 Easy Solve
166 Course Schedule II 30 Medium Solve
167 Design Add and Search Words Data Structure 30 Medium Solve
168 Detect Squares 30 Medium Solve
169 Find Median from Data Stream 40 Hard Solve
170 Generate Parentheses 30 Medium Solve
171 Implement Trie (Prefix Tree) 30 Medium Solve
172 Invert Binary Tree 20 Easy Solve
173 Meeting Rooms II 30 Medium Solve
174 Merge Two Sorted Lists 20 Easy Solve
175 Merge Two Sorted Lists 20 Easy Solve
176 Reverse Nodes in k-Group 40 Hard Solve
177 Serialize and Deserialize Binary Tree 40 Hard Solve
178 Valid Anagram 20 Easy Solve
179 Valid Anagram 20 Easy Solve
180 Contains Duplicate 20 Easy Solve
181 Design Add and Search Words Data Structure 30 Medium Solve
182 Detect Squares 30 Medium Solve
183 Encode and Decode Strings 30 Medium Solve
184 Implement Trie (Prefix Tree) 30 Medium Solve
185 Kth Largest Element in an Array 30 Medium Solve
186 Kth Smallest Element in a BST 30 Medium Solve
187 Lowest Common Ancestor of a Binary Search Tree 30 Medium Solve
188 Meeting Rooms II 30 Medium Solve
189 Merge k Sorted Lists 40 Hard Solve
190 Merge k Sorted Lists 40 Hard Solve
191 Reverse Linked List 20 Easy Solve
192 Valid Anagram 20 Easy Solve
193 Valid Parentheses 20 Easy Solve
194 Alien Dictionary 40 Hard Solve
195 Detect Squares 30 Medium Solve
196 Encode and Decode Strings 30 Medium Solve
197 Find the Duplicate Number 30 Medium Solve
198 House Robber II 30 Medium Solve
199 Implement Trie (Prefix Tree) 30 Medium Solve
200 Meeting Rooms 20 Easy Solve
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