From a given vector of size n + 1, return the duplicate number.
Constraints
The vector can only contain numbers from 1 to n inclusive
Only 1 number is duplicate.
Example -
x = [1 2 3 3]
The size of the vector is 4. Therefore n = 3 and it contains numbers from only 1 to 3 (inclusive). However there is just 1 duplicate number which is 3.
Return the value 3
Solve

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Last Solution submitted on Feb 18, 2026

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George Berken goc3 Riccardo G. Lorenzo

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