使用随机快速排序查找第k个最小元素，给出逻辑错误

So I tried using quicksort for finding the kth smallest element in a vector. But while implementing it my logic is somewhere wrong. And so Im getting wrong answer.I used rand() to generate pivot indexes randomly then shift the pivot index to the right most side of the vector. Check this out:So I tried using quicksort for finding the kth