core dumped

[whnw]

ubuntu 18.04
order=2, other args default

BPTree<int, int> tree(2);
vector arr{1,2,3,4,5,6,7,8,10,11,12,9};
for(int i=0; i<arr.size(); ++i){
tree.put(arr[i],arr[i]);
}
for(int i=8; i<=10; ++i){
tree.remove(arr[i]);
}