Design Circular Queue (LeetCode 622)
The problem Design a circular queue with a fixed capacity . Support: : add at…
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#queue
7 posts
Binary Tree Right Side View (LeetCode 199)
The problem You get the of a binary tree. Imagine standing to its right and…
Binary Tree Level Order Traversal (LeetCode 102)
The problem You get the of a binary tree. Return its values level by level…
Binary Tree Level Order Traversal II (LeetCode 107)
The problem You get the of a binary tree. Return its values level by level, but…
Average of Levels in Binary Tree (LeetCode 637)
The problem You get the of a non-empty binary tree. Return a list where the -th…
Tree BFS (Level-Order Traversal)
When a tree (or grid) problem is about levels or shortest distance, you want BFS…
Design a Notification System
Every product sends notifications — order shipped, someone mentioned you, your…