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In App Router, metadata API defines title, description, Open Graph, robots, and canonical SEO metadata in layouts/pages.
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Array stores contiguous elements and provides O(1) index access. Linked list stores nodes with pointers, easy insertion/deletion if
node is known, but O(n) search.
Stack is LIFO, queue is FIFO. Stack examples: undo, recursion. Queue examples: task scheduling, BFS.
Big O describes how runtime or memory grows with input size. It helps compare algorithm scalability.
Use two indexes moving through data to solve problems like pair sum, reverse, merge sorted arrays, and remove duplicates
efficiently.
Used for subarray/substring problems where a window expands and shrinks to maintain a condition.