Solution for 101-200


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# Name Difficulty Tags
101 Symmetric Tree Easy Tree | Depth-first Search | Breadth-first Search
102 Binary Tree Level Order Traversal Medium Tree | Breadth-first Search
103 Binary Tree Zigzag Level Order Traversal Medium Stack | Tree | Breadth-first Search
104 Maximum Depth of Binary Tree Easy Tree | Depth-first Search
105 Construct Binary Tree from Preorder and Inorder Traversal Medium Array | Tree | Depth-first Search
106 Construct Binary Tree from Inorder and Postorder Traversal Medium Array | Tree | Depth-first Search
107 Binary Tree Level Order Traversal II Medium Tree | Breadth-first Search
108 Convert Sorted Array to Binary Search Tree Easy Tree | Depth-first Search
110 Balanced Binary Tree Easy Tree | Depth-first Search
111 Minimum Depth of Binary Tree Easy Tree | Depth-first Search Breadth-first Search
112 Path Sum Easy Tree | Depth-first Search
113 Path Sum II Medium Tree | Depth-first Search
114 Flatten Binary Tree to Linked List Medium Tree | Depth-first Search
116 Populating Next Right Pointers in Each Node Medium Tree | Depth-first Search
117 Populating Next Right Pointers in Each Node II Medium Tree | Depth-first Search
118 Pascal's Triangle Easy Array
119 Pascal's Triangle II Easy Array
120 Triangle Medium Array | Dynamic Programming
121 Best Time to Buy and Sell Stock Easy Array | Dynamic Programming
122 Best Time to Buy and Sell Stock II Easy Array | Greedy
123 Best Time to Buy and Sell Stock III Hard Array | Dynamic Programming
124 Binary Tree Maximum Path Sum Hard Tree | Depth-first Search
126 Word Ladder II Hard Array | String | Backtracking | Breadth-first Search
129 Sum Root to Leaf Numbers Medium Tree | Depth-first Search
130 Surrounded Regions Medium Depth-first Search | Breadth-first Search | Union Find
141 Linked List Cycle Easy
142 Linked List Cycle II Medium
143 Reorder List Medium
144 Binary Tree Preorder Traversal Medium Stack | Tree
145 Binary Tree Postorder Traversal Medium Tree | Stack
146 LRU Cache Medium
147 Insertion Sort List Medium
148 Sort List Medium
149 Max Points on a Line Hard
150 Evaluate Reverse Polish Notation Medium
151 Reverse Words in a String Medium
152 Maximum Product Subarray Medium Array | Dynamic Programming
153 Find Minimum in Rotated Sorted Array Medium
154 Find Minimum in Rotated Sorted Array II Hard
155 Min Stack Easy
156 Binary Tree Upside Down Medium Tree
160 Intersection of Two Linked Lists Easy
162 Find Peak Element Medium
164 Maximum Gap Hard
165 Compare Version Numbers Medium
166 Fraction to Recurring Decimal Medium
167 Two Sum II - Input array is sorted Easy
168 Excel Sheet Column Title Easy
169 Majority Element Easy
171 Excel Sheet Column Number Easy
172 Factorial Trailing Zeroes Easy
173 Binary Search Tree Iterator Medium Stack | Tree | Design
174 Dungeon Game Hard
176 Second Highest Salary Easy
179 Largest Number Medium
188 Best Time to Buy and Sell Stock IV Hard
189 Rotate Array Medium
190 Reverse Bits Easy
191 Number of 1 Bits Easy
198 House Robber Medium
199 Binary Tree Right Side View Medium Tree | Depth-first Search | Breadth-first Search
200 Number of Islands Medium