Stack [mp]
Micro pattern¶
Problems¶
- 20. Valid Parentheses (Top Easy)
- 155. Min Stack (Top Easy)
- 404. Sum of Left Leaves (Google Prep)
- 445. Add Two Numbers II (Google Prep)
- 94. Binary Tree Inorder Traversal (Top Medium)
- 230. Kth Smallest Element in a BST (Top Medium)
- 150. Evaluate Reverse Polish Notation (Top Medium)