Duplicate Detection
Duplicate Detection by Scan Duplicate detection by scan checks whether any element appears more than once in a sequence. It uses a direct comparison approach without auxiliary data structures. This method is simple and works in all settings, including when hashing or sorting is not allowed. Problem Given a sequence $A$ of length $n$, determine whether there exist indices $i \ne j$ such that $$ A[i] = A[j] $$ Return...