IBM Developer interview questions

frist hackeranker questions are asked 2 questions releted to JD. time limit is 45 min to 60 min. You can choose which ever laugage you are comfortable like c, c++,java, pearl,python Remove duplicates from an array”, “Flatten an array”, “Debounce a function”

I got a leetcode easy and a leetcode medium OA from first round. They passed all tests. It was a 45 minute block and I finished in 30 minutes. I got rejected a week later