ii find_min(node *t,int left,int beg,int end){
if(t==NULL) return inf;
ii r_left=left;
ii r_right=left+t->cnt-1;
ii sz=tree.get_count(t->left)+1;
ii curr_ind=left+tree.get_count(t->left);
if(beg<=r_left && end>=r_right){
return t->diff;
}
ii ret=inf;
if(beg>curr_ind) ret=mini(ret,find_min(t->right,curr_ind+1,beg,end));
else if(end<curr_ind) ret=mini(ret,find_min(t->left,left,beg,end));
else ret=mini(mini(find_min(t->left,left,beg,end)
,find_min(t->right,curr_ind+1,beg,end)),ret);
if(curr_ind>beg && curr_ind<=end && t->left){
ret=mini(ret,t->value - t->left->max_val);
}
if(curr_ind<end && curr_ind>=beg && t->right){
ret=mini(ret,t->right->min_val - t->value);
}
return ret;
}
int find_count(node *t,int value){
if(t==NULL) return 0;
if(value==t->value) return tree.get_count(t->left);
else if(value > t->value) return tree.get_count(t->left)
+find_count(t->right,value)+1;
else return find_count(t->left,value);
}
ii find_kth(node *t,int kth){
if(tree.get_count(t)<kth){
return -1;
}
int sz=tree.get_count(t->left)+1;
if(sz==kth){
return t->value;
}
if(kth<sz){
return find_kth(t->left,kth);
}
else{
return find_kth(t->right,kth-sz);
}
}