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create set main and ds set main

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This commit is contained in:
Jidong Xiao
2025-03-20 23:59:15 -04:00
committed by JamesFlare
parent fb81b68821
commit 956d3892da
5 changed files with 34 additions and 479 deletions
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183
lectures/18_trees_I/ds_set_lec17.h
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@@ -1,183 +0,0 @@
// Partial implementation of binary-tree based set class similar to std::set.
// The iterator increment & decrement operations have been omitted.
#ifndef ds_set_h_
#define ds_set_h_
#include <iostream>
#include <utility>
// -------------------------------------------------------------------
// TREE NODE CLASS
template <class T>
class TreeNode {
public:
TreeNode() : left(NULL), right(NULL) {}
TreeNode(const T& init) : value(init), left(NULL), right(NULL) {}
T value;
TreeNode* left;
TreeNode* right;
};
// -------------------------------------------------------------------
// TREE NODE ITERATOR CLASS
template <class T>
class tree_iterator {
public:
tree_iterator() : ptr_(NULL) {}
tree_iterator(TreeNode<T>* p) : ptr_(p) {}
tree_iterator(const tree_iterator& old) : ptr_(old.ptr_) {}
~tree_iterator() {}
tree_iterator& operator=(const tree_iterator& old) { ptr_ = old.ptr_; return *this; }
// operator* gives constant access to the value at the pointer
const T& operator*() const { return ptr_->value; }
// comparions operators are straightforward
bool operator== (const tree_iterator& rgt) { return ptr_ == rgt.ptr_; }
bool operator!= (const tree_iterator& rgt) { return ptr_ != rgt.ptr_; }
private:
// representation
TreeNode<T>* ptr_;
};
// -------------------------------------------------------------------
// DS_SET CLASS
template <class T>
class ds_set {
public:
ds_set() : root_(NULL), size_(0) {}
ds_set(const ds_set<T>& old) : size_(old.size_) {
root_ = this->copy_tree(old.root_); }
~ds_set() {
this->destroy_tree(root_);
root_ = NULL;
}
ds_set& operator=(const ds_set<T>& old) {
if (&old != this) {
this->destroy_tree(root_);
root_ = this->copy_tree(old.root_);
size_ = old.size_;
}
return *this;
}
typedef tree_iterator<T> iterator;
int size() const { return size_; }
bool operator==(const ds_set<T>& old) const { return (old.root_ == this->root_); }
// FIND, INSERT & ERASE
iterator find(const T& key_value) { return find(key_value, root_); }
std::pair< iterator, bool > insert(T const& key_value) { return insert(key_value, root_); }
int erase(T const& key_value) { return erase(key_value, root_); }
// OUTPUT & PRINTING
friend std::ostream& operator<< (std::ostream& ostr, const ds_set<T>& s) {
s.print_in_order(ostr, s.root_);
return ostr;
}
void print_as_sideways_tree(std::ostream& ostr) const {
print_as_sideways_tree(ostr, root_, 0);
}
// ITERATORS
iterator begin() const {
if (!root_) return iterator(NULL);
TreeNode<T>* p = root_;
while (p->left) p = p->left;
return iterator(p);
}
iterator end() const { return iterator(NULL); }
private:
// REPRESENTATION
TreeNode<T>* root_;
int size_;
// PRIVATE HELPER FUNCTIONS
TreeNode<T>* copy_tree(TreeNode<T>* old_root) {
if (old_root == NULL)
return NULL;
TreeNode<T> *answer = new TreeNode<T>();
answer->value = old_root->value;
answer->left = copy_tree(old_root->left);
answer->right = copy_tree(old_root->right);
return answer;
}
void destroy_tree(TreeNode<T>* p) {
if (!p) return;
destroy_tree(p->right);
destroy_tree(p->left);
delete p;
}
iterator find(const T& key_value, TreeNode<T>* p) {
if (!p) return iterator(NULL);
if (p->value > key_value)
return find(key_value, p->left);
else if (p->value < key_value)
return find(key_value, p->right);
else
return iterator(p);
}
std::pair<iterator,bool> insert(const T& key_value, TreeNode<T>*& p) {
if (!p) {
p = new TreeNode<T>(key_value);
this->size_++;
return std::pair<iterator,bool>(iterator(p), true);
}
else if (key_value < p->value)
return insert(key_value, p->left);
else if (key_value > p->value)
return insert(key_value, p->right);
else
return std::pair<iterator,bool>(iterator(p), false);
}
int erase(T const& key_value, TreeNode<T>* &p) {
if (!p) return 0;
// look left & right
if (p->value < key_value)
return erase(key_value, p->right);
else if (p->value > key_value)
return erase(key_value, p->left);
// Found the node. Let's delete it
assert (p->value == key_value);
if (!p->left && !p->right) { // leaf
delete p; p=NULL;
} else if (!p->left) { // no left child
TreeNode<T>* q = p; p=p->right; delete q;
} else if (!p->right) { // no right child
TreeNode<T>* q = p; p=p->left; delete q;
} else { // Find rightmost node in left subtree
TreeNode<T>* &q = p->left;
while (q->right) q = q->right;
p->value = q->value;
int check = erase(q->value, q);
assert (check == 1);
}
return 1;
}
void print_in_order(std::ostream& ostr, const TreeNode<T>* p) const {
if (p) {
print_in_order(ostr, p->left);
ostr << p->value << "\n";
print_in_order(ostr, p->right);
}
}
void print_as_sideways_tree(std::ostream& ostr, const TreeNode<T>* p, int depth) const {
if (p) {
print_as_sideways_tree(ostr, p->right, depth+1);
for (int i=0; i<depth; ++i) ostr << " ";
ostr << p->value << "\n";
print_as_sideways_tree(ostr, p->left, depth+1);
}
}
};
#endif

14
lectures/18_trees_I/ds_set_main.cpp
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@@ -1,28 +1,20 @@
#include <iostream> #include <iostream>
#include "ds_set_starter.h" #include "ds_set_starter.h"
// #include <set>
int main() { int main() {
// create a set of integers // create a set of integers
std::set<int> numbers; ds_set<int> numbers;
// insert some values into the set // insert some values into the set
numbers.insert(10); numbers.insert(10);
numbers.insert(5); numbers.insert(5);
numbers.insert(20); numbers.insert(20);
numbers.insert(15); numbers.insert(15);
numbers.insert(5); // Duplicate value (won't be inserted) numbers.insert(5); // duplicate value (won't be inserted)
// print the elements of the set
std::cout << "The elements in the set are:" << std::endl;
for (int num : numbers) {
std::cout << num << " ";
}
std::cout << std::endl;
// check if a specific value exists in the set // check if a specific value exists in the set
int value = 15; int value = 15;
if (numbers.find(value) != numbers.end()) { if (numbers.find(value) == true) {
std::cout << value << " is found in the set." << std::endl; std::cout << value << " is found in the set." << std::endl;
} else { } else {
std::cout << value << " is not found in the set." << std::endl; std::cout << value << " is not found in the set." << std::endl;

31
lectures/18_trees_I/set_main.cpp Normal file
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@@ -0,0 +1,31 @@
#include <iostream>
#include <set>
int main() {
// create a set of integers
std::set<int> numbers;
// insert some values into the set
numbers.insert(10);
numbers.insert(5);
numbers.insert(20);
numbers.insert(15);
numbers.insert(5); // duplicate value (won't be inserted)
// print the elements of the set
std::cout << "The elements in the set are:" << std::endl;
for (int num : numbers) {
std::cout << num << " ";
}
std::cout << std::endl;
// check if a specific value exists in the set
int value = 15;
if (numbers.find(value) != numbers.end()) {
std::cout << value << " is found in the set." << std::endl;
} else {
std::cout << value << " is not found in the set." << std::endl;
}
return 0;
}

155
lectures/19_trees_II/ds_set_lec18_moresoln.h
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@@ -1,155 +0,0 @@
// -------------------------------------------------------------------
// TREE NODE CLASS
template <class T>
class TreeNode {
public:
TreeNode() : left(NULL), right(NULL)/*, parent(NULL)*/ {}
TreeNode(const T& init) : value(init), left(NULL), right(NULL)/*, parent(NULL)*/ {}
T value;
TreeNode* left;
TreeNode* right;
// one way to allow implementation of iterator increment & decrement
// TreeNode* parent;
};
// -------------------------------------------------------------------
// TREE NODE ITERATOR CLASS
template <class T>
class tree_iterator {
public:
tree_iterator() : ptr_(NULL) {}
tree_iterator(TreeNode<T>* p) : ptr_(p) {}
tree_iterator(const tree_iterator& old) : ptr_(old.ptr_) {}
~tree_iterator() {}
tree_iterator& operator=(const tree_iterator& old) { ptr_ = old.ptr_; return *this; }
// operator* gives constant access to the value at the pointer
const T& operator*() const { return ptr_->value; }
// comparison operators are straightforward
bool operator== (const tree_iterator& rgt) { return ptr_ == rgt.ptr_; }
bool operator!= (const tree_iterator& rgt) { return ptr_ != rgt.ptr_; }
// increment & decrement operators
tree_iterator<T> & operator++() { /* discussed & implemented in Lecture 18 */
// if i have right subtree, find left most element of those
if (ptr_->right_ != NULL) {
ptr_ = ptr_->right_;
while (ptr_->left != NULL) {
ptr_ = ptr_->left_;
}
} else {
//TreeNode<T> *tmp = ptr_;
// Keep going up as long as I'm my parent's right child
//while (tmp->value < value ) {
while (ptr_->parent && ptr_->parent_->right == ptr_)
ptr_ = ptr_->parent_;
}
// Go up one more time
ptr_ = ptr_->parent;
}
return *this;
}
tree_iterator<T> operator++(int) { tree_iterator<T> temp(*this); ++(*this); return temp; }
tree_iterator<T> & operator--() { /* implementation omitted */ }
tree_iterator<T> operator--(int) { tree_iterator<T> temp(*this); --(*this); return temp; }
private:
// representation
TreeNode<T>* ptr_;
};
// -------------------------------------------------------------------
// DS_SET CLASS
template <class T>
class ds_set {
public:
ds_set() : root_(NULL), size_(0) {}
ds_set(const ds_set<T>& old) : size_(old.size_) { root_ = this->copy_tree(old.root_,NULL); }
~ds_set() { this->destroy_tree(root_); }
ds_set& operator=(const ds_set<T>& old) { /* implementation omitted */ }
typedef tree_iterator<T> iterator;
int size() const { return size_; }
bool operator==(const ds_set<T>& old) const { return (old.root_ == this->root_); }
// FIND, INSERT & ERASE
iterator find(const T& key_value) { return find(key_value, root_); }
std::pair< iterator, bool > insert(T const& key_value) { return insert(key_value, root_); }
int erase(T const& key_value) { return erase(key_value, root_); }
// OUTPUT & PRINTING
friend std::ostream& operator<< (std::ostream& ostr, const ds_set<T>& s) {
s.print_in_order(ostr, s.root_);
return ostr;
}
// ITERATORS
iterator begin() const {
if (!root_) return iterator(NULL);
TreeNode<T>* p = root_;
while (p->left) p = p->left;
return iterator(p);
}
iterator end() const { return iterator(NULL); }
private:
// REPRESENTATION
TreeNode<T>* root_;
int size_;
// PRIVATE HELPER FUNCTIONS
TreeNode<T>* copy_tree(TreeNode<T>* old_root) { /* Implemented in Lab 9 */ }
void destroy_tree(TreeNode<T>* p) {
if (!p) return;
destroy_tree(p->left);
destroy_tree(p->right);
delete p;
}
/*void destroy_tree(TreeNode<T>* & p) {
// Implemented in Lecture 19
if (!p) {
p = NULL;
size = 0;
return;
}
destroy_tree(p->left);
TreeNode<T>* tmp = p->right;
delete p;
destroy_tree(tmp);
}
*/
}
iterator find(const T& key_value, TreeNode<T>* p) { /* Implemented in Lecture 17 */ }
std::pair<iterator,bool> insert(const T& key_value, TreeNode<T>*& p) {
// NOTE: will need revision to support & maintain parent pointers
if (!p) {
p = new TreeNode<T>(key_value);
this->size_++;
return std::pair<iterator,bool>(iterator(p), true);
}
else if (key_value < p->value)
return insert(key_value, p->left);
else if (key_value > p->value)
return insert(key_value, p->right);
else
return std::pair<iterator,bool>(iterator(p), false);
}
int erase(T const& key_value, TreeNode<T>* &p) { /* Implemented in Lecture 19 */ }
void print_in_order(std::ostream& ostr, const TreeNode<T>* p) const {
if (p) {
print_in_order(ostr, p->left);
ostr << p->value << "\n";
print_in_order(ostr, p->right);
}
}
};

130
lectures/19_trees_II/ds_set_lec18_starter.h
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@@ -1,130 +0,0 @@
// -------------------------------------------------------------------
// TREE NODE CLASS
template <class T>
class TreeNode {
public:
TreeNode() : left(NULL), right(NULL)/*, parent(NULL)*/ {}
TreeNode(const T& init) : value(init), left(NULL), right(NULL)/*, parent(NULL)*/ {}
T value;
TreeNode* left;
TreeNode* right;
// one way to allow implementation of iterator increment & decrement
// TreeNode* parent;
};
// -------------------------------------------------------------------
// TREE NODE ITERATOR CLASS
template <class T>
class tree_iterator {
public:
tree_iterator() : ptr_(NULL) {}
tree_iterator(TreeNode<T>* p) : ptr_(p) {}
tree_iterator(const tree_iterator& old) : ptr_(old.ptr_) {}
~tree_iterator() {}
tree_iterator& operator=(const tree_iterator& old) { ptr_ = old.ptr_; return *this; }
// operator* gives constant access to the value at the pointer
const T& operator*() const { return ptr_->value; }
// comparions operators are straightforward
bool operator== (const tree_iterator& rgt) { return ptr_ == rgt.ptr_; }
bool operator!= (const tree_iterator& rgt) { return ptr_ != rgt.ptr_; }
// increment & decrement operators
tree_iterator<T> & operator++() { /* discussed & implemented in Lecture 19 */
return *this;
}
tree_iterator<T> operator++(int) { tree_iterator<T> temp(*this); ++(*this); return temp; }
tree_iterator<T> & operator--() { /* implementation omitted */ }
tree_iterator<T> operator--(int) { tree_iterator<T> temp(*this); --(*this); return temp; }
private:
// representation
TreeNode<T>* ptr_;
};
// -------------------------------------------------------------------
// DS_SET CLASS
template <class T>
class ds_set {
public:
//CONSTRUCTORS, DESTRUCTORS, ASSIGNMENT OPERATOR
ds_set() : root_(NULL), size_(0) {}
ds_set(const ds_set<T>& old) : size_(old.size_) { root_ = this->copy_tree(old.root_,NULL); }
~ds_set() { this->destroy_tree(root_); root_ = NULL; }
ds_set& operator=(const ds_set<T>& old) { /* implementation omitted */ }
typedef tree_iterator<T> iterator;
int size() const { return size_; }
bool operator==(const ds_set<T>& old) const { return (old.root_ == this->root_); }
// FIND, INSERT & ERASE
iterator find(const T& key_value) { return find(key_value, root_); }
std::pair< iterator, bool > insert(T const& key_value) { return insert(key_value, root_); }
int erase(T const& key_value) { return erase(key_value, root_); }
// OUTPUT & PRINTING
friend std::ostream& operator<< (std::ostream& ostr, const ds_set<T>& s) {
s.print_in_order(ostr, s.root_);
return ostr;
}
// ITERATORS
iterator begin() const {
if (!root_) return iterator(NULL);
TreeNode<T>* p = root_;
while (p->left) p = p->left;
return iterator(p);
}
iterator end() const { return iterator(NULL); }
private:
// REPRESENTATION
TreeNode<T>* root_;
int size_;
// PRIVATE HELPER FUNCTIONS
TreeNode<T>* copy_tree(TreeNode<T>* old_root) { /* Implemented in Lab 9 */ }
void destroy_tree(TreeNode<T>* p) {
/* Implemented in Lecture 18 */
}
iterator find(const T& key_value, TreeNode<T>* p) { /* Implemented in Lecture 17 */ }
std::pair<iterator,bool> insert(const T& key_value, TreeNode<T>*& p) {
// NOTE: will need revision to support & maintain parent pointers
if (!p) {
p = new TreeNode<T>(key_value);
this->size_++;
return std::pair<iterator,bool>(iterator(p), true);
}
else if (key_value < p->value)
return insert(key_value, p->left);
else if (key_value > p->value)
return insert(key_value, p->right);
else
return std::pair<iterator,bool>(iterator(p), false);
}
int erase(T const& key_value, TreeNode<T>* &p) { /* Implemented in Lecture 19 */ }
void print_in_order(std::ostream& ostr, const TreeNode<T>* p) const {
if (p) {
print_in_order(ostr, p->left);
ostr << p->value << "\n";
print_in_order(ostr, p->right);
}
}
};