Grokking the Coding Interview: Patterns for Coding Questions
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Problem Challenge 1: Find the Corrupt Pair (easy)
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Problem Statement

We are given an unsorted array containing ‘n’ numbers taken from the range 1 to ‘n’. The array originally contained all the numbers from 1 to ‘n’, but due to a data error, one of the numbers got duplicated which also resulted in one number going missing. Find both these numbers.

Example 1:

Input: [3, 1, 2, 5, 2]
Output: [2, 4]
Explanation: '2' is duplicated and '4' is missing.

Example 2:

Input: [3, 1, 2, 3, 6, 4]
Output: [3, 5]
Explanation: '3' is duplicated and '5' is missing.

Constraints:

  • 2 <= nums.length <= 10^4
  • 1 <= nums[i] <= 10^4

Try it yourself

Try solving this question here:

Python3
Python3
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