Coding Interview Data Engineer Find Duplicate Number in given List leetcode
https://leetcode.com/problems/remove-...
leetcode data engineer
Find the duplicate number
"Mastering Coding Interviews: Data Engineer Edition - Solving the 'Find Duplicate Number' Problem on LeetCode"
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Assume that there is only one duplicate number, find the duplicate one.
Note:
You must not modify the array (assume the array is read only).
You must use only constant, O(1) extra space.
Your runtime complexity should be less than O(n2).
There is only one duplicate number in the array, but it could be repeated more than once.
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