Uploaded January 2020 | Updated September 2026, 3 days ago

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Commented code: codechef.com/viewsolution/28958507
"Queries for number of distinct elements in a subarray":
geeksforgeeks.org/queries-number-distinct-elements-subarray
Stack algorithm for "next greater element":
geeksforgeeks.org/next-greater-element
Persistent segment tree:
geeksforgeeks.org/persistent-segment-tree-set-1-introduction
Comments, questions, requests, criticism, are all welcome!