Round 1 DSA

Problem: Kth Largest Element in a Stream (LC #703)

As interviewer told that there would be just one problem in this round so i started with bruteforce sorting solution just to pass time and then optimized it to best solution using min-heap.
Coded the solution cleanly with proper handling of all cases. Interview seemed to go well with no negative feedback.
Still got rejected the next day without explanation.
Frustrating when you solve everything correctly but still get rejected. It unnecessarily waste time. Anyone else experience this with Blinkit?