Interview Q&A / Data Structures & Algorithms
Data Structures & Algorithms interview questions
Arrays, linked lists, hashing, trees and patterns, with line-by-line code and complexity.
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- How do you find the node where a cycle begins in a linked list?
Detect the cycle with slow and fast pointers. When they meet, reset one pointer to the head and move both one step at a time. They meet again exactly at the start of the cycle.
AdvancedQuick answerCoding1 min read