baoshuo/OI-codes
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P3369 【模板】普通平衡树

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R69586144
This commit is contained in:
Baoshuo Ren 2022-02-18 14:44:41 +08:00
parent 9680921911
commit 886c3ea0db
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 5 additions and 14 deletions
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19
Luogu/P3369/P3369.cpp
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@ -25,11 +25,9 @@ class Treap {
std::pair<node *, node *> split(node *, int);
std::pair<node *, node *> splitByValue(node *, int);
node *merge(node *, node *);
int _getRank(node *, int);
public:
Treap();
~Treap();
void insert(int);
void erase(int);
@ -60,10 +58,6 @@ inline void Treap::node::pushup() {
Treap::Treap()
: root(nullptr) {}
Treap::~Treap() {
delete root;
}
inline int Treap::getNodeSize(Treap::node *node) {
return node == nullptr ? 0 : node->size;
}
@ -138,14 +132,11 @@ void Treap::erase(int val) {
this->root = this->merge(o.first, t.second);
}
int Treap::_getRank(Treap::node *p, int val) {
if (p == nullptr) return 1;
if (val <= p->val) return this->_getRank(p->left, val);
return this->getNodeSize(p->left) + 1 + this->_getRank(p->right, val);
}
inline int Treap::getRank(int val) {
return this->_getRank(this->root, val);
int Treap::getRank(int val) {
auto x = this->splitByValue(this->root, val);
int r = this->getNodeSize(x.first) + 1;
this->root = merge(x.first, x.second);
return r;
}
int Treap::getKth(int k) {