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🔥Kth Largest Element in an Array: QuickSelect OrderMedium
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MediumArrays & Hashing•Acceptance: 66.7%

Kth Largest Element in an Array: QuickSelect Order

Targeted in FAANG & Tech OA:MetaAmazonMicrosoft
Real-World Engineering Context
Used in real-time quantile monitoring, top-k leaderboard rank slicing, and database order limit offset execution.
Given an integer array `nums` and an integer `k`, return the `k`th largest element in the array. Note that it is the `k`th largest element in the sorted order, not the `k`th distinct element. Can you solve it without sorting in `O(n)` average time?

Sample Test Cases

Input: [[3,2,1,5,6,4],2]
Expected: 5
Input: [[3,2,3,1,2,4,5,5,6],4]
Expected: 4
Input: [[1],1]
Expected: 1

Constraints

  • 1 <= k <= nums.length <= 10^5
  • -10^4 <= nums[i] <= 10^4
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