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-rw-r--r--I_anno/Programmazione_2/data_structures/bfs.cc186
-rw-r--r--I_anno/Programmazione_2/data_structures/bst.cc225
-rw-r--r--I_anno/Programmazione_2/data_structures/circle_double_list.cc185
-rw-r--r--I_anno/Programmazione_2/data_structures/circle_list.cc189
-rw-r--r--I_anno/Programmazione_2/data_structures/dfs.cc191
-rw-r--r--I_anno/Programmazione_2/data_structures/graph.cc164
-rw-r--r--I_anno/Programmazione_2/data_structures/graph_stl.cc221
-rw-r--r--I_anno/Programmazione_2/data_structures/list.cc164
-rw-r--r--I_anno/Programmazione_2/data_structures/list_double.cc182
-rw-r--r--I_anno/Programmazione_2/data_structures/matrix-graph.cc81
-rw-r--r--I_anno/Programmazione_2/data_structures/queue.cc72
-rw-r--r--I_anno/Programmazione_2/data_structures/queue_w_array.cc66
-rw-r--r--I_anno/Programmazione_2/data_structures/stack.cc70
-rw-r--r--I_anno/Programmazione_2/data_structures/stack_w_array.cc50
-rw-r--r--I_anno/Programmazione_2/data_structures/top-sort.cc212
15 files changed, 0 insertions, 2258 deletions
diff --git a/I_anno/Programmazione_2/data_structures/bfs.cc b/I_anno/Programmazione_2/data_structures/bfs.cc
deleted file mode 100644
index 2b4efbd..0000000
--- a/I_anno/Programmazione_2/data_structures/bfs.cc
+++ /dev/null
@@ -1,186 +0,0 @@
-#include<iostream>
-#include<vector>
-#include<queue>
-#define W -1
-#define G 0
-#define B 1
-
-using namespace std;
-
-template<class H>
-class node {
-public:
- explicit node(H key, node<H>* next) : _key{key}, _next(next) {}
- const H& key() const { return _key; }
- H& key() { return _key; }
- const node<H>*& next() const { return _next; }
- node<H>*& next() { return _next; }
-private:
- H _key;
- node<H>* _next;
-};
-
-template<class H>
-class list {
-public:
- list() : _head{nullptr} {}
- ~list() {
- while(_head) {
- auto tmp = _head;
- _head = _head->next();
- delete tmp;
- }
- }
- list<H>* push(H val) {
- auto iter = _head;
- while(iter && iter->next())
- iter = iter->next();
-
- if(!iter)
- _head = new node<H>{val, nullptr};
- else
- iter->next() = new node<H>{val, nullptr};
-
- return this;
- }
- void print() {
- auto iter = _head;
- while(iter) {
- cout << iter->key() << ' ';
- iter = iter->next();
- }
- }
- vector<H> as_vector() {
- vector<H> v;
- auto iter = _head;
- while(iter) {
- v.push_back(iter->key());
- iter = iter->next();
- }
- return v;
- }
- node<H>* search(H val) {
- auto iter = _head;
- while(iter && iter->key() != val) {
- iter = iter->next();
- }
-
- return iter;
- }
-private:
- node<H>* _head;
-};
-
-template<class H>
-class graph {
-public:
-
-private:
- int _len, _nodes, _edges;
- int* _parents;
- int* _distances;
- H** _k; // it works like a dictionary, it saves the keys
- list<int>** _adj;
- int _index(H val) {
- for(int i = 0; i < _nodes; ++i)
- if(*_k[i] == val) return i;
-
- return -1;
- }
-public:
- graph(int len) : _len{len}, _nodes{0}, _edges{0} {
- _k = new H*[len];
- _adj = new list<int>*[_len];
- _parents = new int[_len];
- _distances = new int[_len];
- for(int i = 0; i < _len; ++i) {
- _k[i] = nullptr;
- _adj[i] = new list<int>{};
- }
- }
-
- graph<H>* add_node(H k) {
- if(_nodes == _len) return this;
- if(_index(k) >= 0) return this; // node is already there
-
- _k[_nodes++] = new H(k);
-
- return this;
- }
-
- void bfs(int s) {
- int colors[_len];
- queue<int> q;
-
- for(int i = 0; i < _nodes; ++i) {
- colors[i] = W;
- _parents[i] = -1;
- _distances[i] = 999999999;
- }
- q.push(s);
- colors[s] = G;
- _distances[s] = 0;
- while(!q.empty()) {
- int x = q.front();
- q.pop();
- for(auto const& j : _adj[x]->as_vector()) {
- if(colors[j] == W) {
- colors[j] = G;
- q.push(j);
- _parents[j] = x;
- _distances[j] = _distances[x] + 1;
- }
- }
- colors[x] = B;
- }
-
- for(int i = 0; i < _nodes; ++i) {
- cout << "[" << i << "]->";
- if(_distances[i]==999999999) cout << "inf." << endl;
- else cout << _distances[i] << endl;
- }
- }
-
- void bfs(H x) {
- int s = _index(x);
- if(s != -1)
- bfs(s);
- }
-
- graph<H>* add_edge(H x, H y) {
- int i = _index(x);
- int j = _index(y);
- if(i < 0 || j < 0) return this;
-
- if(!_adj[i]->search(j)) {
- _adj[i]->push(j);
- _edges++;
- }
-
- return this;
- }
-
- void print() {
- for(int i = 0; i < _nodes; ++i) {
- cout << "(" << i << ", " << *_k[i] << "): ";
- for(auto const& j : _adj[i]->as_vector())
- cout << "(" << j << ", " << *_k[j] << "), ";
- cout << '\n';
- }
- }
-};
-
-
-int main() {
- graph<string>* g = new graph<string>(5);
- g->add_node("hello")->add_node("greg")->add_node("yes");
- g->add_node("nop")->add_node("ok");
- g->add_edge("hello", "ok");
- g->add_edge("ok", "yes")->add_edge("yes", "ok")->add_edge("yes", "yes");
- g->add_edge("yes", "nop");
- g->print();
- g->bfs("hello");
-
- delete g;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/bst.cc b/I_anno/Programmazione_2/data_structures/bst.cc
deleted file mode 100644
index 9223e04..0000000
--- a/I_anno/Programmazione_2/data_structures/bst.cc
+++ /dev/null
@@ -1,225 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<class T>
-struct node {
- T key;
- node<T>* prev;
- node<T>* right;
- node<T>* left;
-};
-
-template<class T>
-class bst {
-public:
- bst() : root{nullptr} {}
-
- ~bst() {
- // TODO
- }
-
- bst<T>* insert(initializer_list<T>&& list) {
- for(auto const& i : list)
- insert(i);
-
- return this;
- }
-
- bst<T>* insert(T k) {
- node<T>* nodus = new node<T>{k, nullptr, nullptr, nullptr};
- node<T>* iter = root;
- node<T>* prev = nullptr;
-
- while(iter) {
- prev = iter;
- iter = (k < iter->key) ? iter->left : iter->right;
- }
-
- nodus->prev = prev;
- if(!prev)
- root = nodus;
- else if(k < prev->key)
- prev->left = nodus;
- else
- prev->right = nodus;
-
- return this;
- }
-
- bst<T>* remove(initializer_list<T>&& list) {
- for(auto const& i : list)
- remove(i);
-
- return this;
- }
-
- bst<T>* remove(T k) {
- node<T>* nodus = search(k);
- if(!nodus) return this;
-
- if(!nodus->left) {
- _transplant(nodus, nodus->right);
- } else if(!nodus->right) {
- _transplant(nodus, nodus->left);
- } else {
- node<T>* iter = _min(nodus->right);
- if(iter->prev != nodus) {
- _transplant(iter, iter->right);
- iter->right = nodus->right;
- iter->right->prev = iter;
- }
- _transplant(nodus, iter);
- iter->left = nodus->left;
- iter->left->prev = iter;
- }
-
- delete nodus;
- return this;
- }
-
- node<T>* min() {
- return _min(root);
- }
-
- node<T>* min(node<T>* nodus) {
- return _min(nodus);
- }
-
- node<T>* max() {
- return _max(root);
- }
-
- node<T>* max(node<T>* nodus) {
- return _max(nodus);
- }
-
- node<T>* search(T k) {
- node<T>* iter = root;
- while(iter && iter->key != k)
- iter = (iter->key > k) ? iter->left : iter->right;
-
- return iter;
- }
-
- node<T>* successor(T k) {
- node<T>* nodus = search(k);
- if(!nodus) return nullptr;
-
- if(nodus->right)
- return min(nodus->right);
-
- node<T>* prev = nodus->prev;
- while(prev && nodus == prev->right) {
- nodus = prev;
- prev = prev->prev;
- }
-
- return prev;
-
- }
- node<T>* predecessor(T k) {
- node<T>* nodus = search(k);
- if(!nodus) return nullptr;
-
- if(nodus->left)
- return max(nodus->left);
-
- node<T>* prev = nodus->prev;
- while(prev && nodus == prev->left) {
- nodus = prev;
- prev = prev->prev;
- }
-
- return prev;
- }
-
- friend ostream& operator<<(ostream& os, bst<T>* tree) {
- tree->_preorder(os, tree->root);
- return os;
- }
-private:
- void _transplant(node<T>* u, node<T>* v) {
- if(!u->prev) {
- root = v;
- } else if(u == u->prev->left) {
- u->prev->left = v;
- } else {
- u->prev->right = v;
- }
-
- if(v)
- v->prev = u->prev;
- }
-
- node<T>* _min(node<T>* root) {
- node<T>* iter = root;
- while(iter && iter->left)
- iter = iter->left;
-
- return iter;
- }
-
- node<T>* _max(node<T>* root) {
- node<T>* iter = root;
- while(iter && iter->right)
- iter = iter->right;
-
- return iter;
- }
-
- void _inorder(ostream& os, node<T>* root) {
- if(root) {
- _inorder(os, root->left);
- os << root->key << ' ';
- _inorder(os, root->right);
- }
- }
-
- void _preorder(ostream& os, node<T>* root) {
- if(root) {
- os << root->key << ' ';
- _inorder(os, root->left);
- _inorder(os, root->right);
- }
- }
-
- void _postorder(ostream& os, node<T>* root) {
- if(root) {
- _inorder(os, root->left);
- _inorder(os, root->right);
- os << root->key << ' ';
- }
- }
- node<T>* root;
-};
-
-int main() {
- bst<int>* b = new bst<int>{};
-
- // b->insert(12)->insert(5)->insert(18)->insert(2)->insert(9);
- // b->insert(15)->insert(13)->insert(17)->insert(19);
-
- b->insert({12, 5, 18, 2, 9, 15, 13, 17, 19});
- cout << b << endl;
- cout << (b->search(5) != nullptr) << endl;
- cout << (b->search(1) != nullptr) << endl;
- cout << b->max()->key << ' ' << b->min()->key << endl;
- for(auto const& i : {12, 9, 14, 18}) {
- auto elem = b->successor(i);
- if(elem)
- cout << "(" << i << ", " << elem->key << ") ";
- }
- cout << endl;
-
- for(auto const& i : {9, 2, 5, 15, 18, 12, 19}) {
- auto elem = b->predecessor(i);
- if(elem)
- cout << "(" << i << ", " << elem->key << ") ";
- }
- cout << endl;
- b->remove({5, 12});
- cout << b << endl;
-
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/circle_double_list.cc b/I_anno/Programmazione_2/data_structures/circle_double_list.cc
deleted file mode 100644
index f162e57..0000000
--- a/I_anno/Programmazione_2/data_structures/circle_double_list.cc
+++ /dev/null
@@ -1,185 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<typename T>
-struct node {
- T value;
- node* prev;
- node* next;
-};
-
-
-template<typename T>
-class list {
-public:
- list() : _head{nullptr} {}
-
- ~list() {
- node<T>* iter = _head;
- while(iter->next != _head) {
- node<T>* tmp = iter;
- delete tmp;
- iter = iter->next;
- }
- node<T>* tmp = iter;
- delete tmp;
- }
-
- list* push_front(T val) {
- auto elem = _last();
- if(!_head) {
- _head = new node<T>{val, nullptr, nullptr};
- _head->prev = _head->next = _head;
- } else {
- _head = new node<T>{val, elem, _head};
- elem->next = _head->next->prev = _head;
- }
-
- return this;
- }
-
- list* push_back(T val) {
- if(!_head) return this->push_front(val);
-
- auto last_e = _last();
- last_e->next = new node<T>{val, last_e, _head};
- _head->prev = last_e->next;
-
- return this;
- }
-
- list* push_after_value(T val, T newval) {
- node<T>* iter = _search(val);
- if(iter) {
- node<T>* nod = new node<T>{newval, iter, iter->next};
- iter->next = nod;
- nod->next->prev = nod;
- }
-
- return this;
- }
-
- list* push_before_value(T val, T newval) {
- node<T>* elem = _search(val);
- if(!elem) return this;
-
- node<T>* iter = _head;
-
- if(iter->value == val)
- return this->push_front(newval);
-
- while(iter->next != elem)
- iter = iter->next;
-
- node<T>* nod = new node<T>{newval, iter, iter->next};
- iter->next = nod;
- nod->next->prev = nod;
-
- return this;
- }
-
- list* pop(int val) {
- node<T>* elem = _search(val);
- if(!elem) return this;
-
- if(elem == _head) return this->pop_front();
-
- node<T>* iter = elem->prev;
- node<T>* temp = iter->next;
- iter->next = iter->next->next;
- iter->next->prev = iter;
- delete temp;
-
- return this;
- }
-
- list* pop_front() {
- if(!_head)
- return this;
-
- auto last_e = _last();
- node<T>* elem = _head;
- _head = _head->next;
- _head->prev = last_e;
- last_e->next = _head;
- delete elem;
-
- return this;
- }
-
- list* pop_back() {
- if(!_head)
- return this;
-
- auto last_e = _last();
-
- if(last_e == _head) {
- delete _head;
- _head = nullptr;
- } else {
- auto iter = last_e->prev;
- delete iter->next;
- iter->next = _head;
- _head->prev = iter;
- }
-
- return this;
- }
-
- void print() {
- node<T>* iter = _head;
- while(iter != nullptr) {
- cout << iter->value << ' ';
- cout << "[[ " << iter->prev->value << ", ";
- cout << iter->next->value << " ]], ";
- iter = iter->next;
- if(iter == _head) break;
- }
- }
-private:
- node<T>* _last() {
- node<T>* iter = _head;
- while(iter && iter->next != _head) {
- iter = iter->next;
- }
-
- return iter;
- }
-
- node<T>* _search(T val) {
- node<T>* iter = _head;
- if(iter->value == val) return iter;
-
- while(iter && iter->value != val) {
- iter = iter->next;
- if(iter == _head) return nullptr;
- }
-
- return iter;
- }
-
- node<T>* _head;
-};
-
-int main() {
- list<int>* l = new list<int>{};
- l->push_front(2);
- l->push_back(1)->push_back(3);
- l->push_front(5)->push_front(9);
- l->push_back(0)->push_back(6);
- l->print(); cout << '\n';
- l->push_after_value(7, -2);
- l->push_before_value(9, 10);
- l->print(); cout << '\n';
- l->pop_front();
- l->pop_front();
- l->pop_back();
- l->pop_front();
- l->print(); cout << '\n';
- l->pop(2);
- l->print(); cout << '\n';
-
- delete l;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/circle_list.cc b/I_anno/Programmazione_2/data_structures/circle_list.cc
deleted file mode 100644
index 2143ac1..0000000
--- a/I_anno/Programmazione_2/data_structures/circle_list.cc
+++ /dev/null
@@ -1,189 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<typename T>
-struct node {
- T value;
- node* next;
-};
-
-
-template<typename T>
-class list {
-public:
- list() : _head{nullptr} {}
-
- ~list() {
- node<T>* iter = _head;
- while(iter->next != _head) {
- node<T>* tmp = iter;
- delete tmp;
- iter = iter->next;
- }
- node<T>* tmp = iter;
- delete tmp;
- }
-
- list* push_front(T val) {
- auto elem = _last();
- _head = new node<T>{val, _head};
- if(!elem)
- elem = _head;
-
- elem->next = _head;
-
- return this;
- }
-
- list* push_back(T val) {
- if(!_head) return this->push_front(val);
-
- auto last_e = _last();
- last_e->next = new node<T>{val, _head};
-
- return this;
- }
-
- list* push_after_value(T val, T newval) {
- node<T>* iter = _search(val);
- if(iter)
- iter->next = new node<T>{newval, iter->next};
-
- return this;
- }
-
- list* push_before_value(T val, T newval) {
- node<T>* elem = _search(val);
- if(!elem) return this;
-
- node<T>* iter = _head;
-
- if(iter->value == val)
- return this->push_front(newval);
-
- while(iter->next != elem)
- iter = iter->next;
-
- iter->next = new node<T>{newval, iter->next};
-
- return this;
- }
-
- list* pop(int val) {
- node<T>* elem = _search(val);
- if(!elem) return this;
-
- node<T>* iter = _head;
- if(iter == elem) return this->pop_front();
-
- while(iter->next != elem)
- iter = iter->next;
-
- node<T>* temp = iter->next;
- iter->next = iter->next->next;
- delete temp;
-
- return this;
- }
-
- list* pop_front() {
- if(!_head)
- return this;
-
- auto last_e = _last();
-
- if(last_e == _head) {
- delete _head;
- _head = nullptr;
- } else {
- node<T>* elem = _head;
- _head = _head->next;
- last_e->next = _head;
- delete elem;
- }
-
- return this;
- }
-
- list* pop_back() {
- if(!_head)
- return this;
-
- node<T>* iter = _head;
- auto last_e = _last();
-
- if(last_e == _head) {
- delete iter;
- _head = nullptr;
- } else {
- while(iter->next != last_e) {
- iter = iter->next;
- }
-
- delete iter->next;
- iter->next = _head;
- }
-
- return this;
- }
-
- void print() {
- node<T>* iter = _head;
- while(iter) {
- cout << iter->value << ' ';
- iter = iter->next;
- if(iter == _head) break;
- }
- }
-private:
- node<T>* _last() {
- node<T>* iter = _head;
- while(iter && iter->next != _head) {
- iter = iter->next;
- }
-
- return iter;
- }
-
- node<T>* _search(T val) {
- node<T>* iter = _head;
- if(iter->value == val) return iter;
-
- while(iter && iter->value != val) {
- iter = iter->next;
- if(iter == _head) return nullptr;
- }
-
- return iter;
- }
-
- node<T>* _head;
-};
-
-int main() {
- list<int>* l = new list<int>{};
- l->push_before_value(4, 1);
- l->push_back(4);
- l->push_back(1);
- l->push_back(0);
- l->push_front(2);
- l->print(); cout << endl;
- l->pop_back();
- l->print(); cout << endl;
- l->pop_front();
- l->print(); cout << endl;
- l->pop_back();
- l->print(); cout << endl;
- l->push_front(3);
- l->print(); cout << endl;
- l->push_after_value(4, 7);
- l->print(); cout << endl;
- l->push_before_value(3, 5);
- l->print(); cout << endl;
- l->pop(5);
- l->print(); cout << endl;
-
- delete l;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/dfs.cc b/I_anno/Programmazione_2/data_structures/dfs.cc
deleted file mode 100644
index 744f153..0000000
--- a/I_anno/Programmazione_2/data_structures/dfs.cc
+++ /dev/null
@@ -1,191 +0,0 @@
-#include<iostream>
-#include<vector>
-#include<queue>
-#define W -1
-#define G 0
-#define B 1
-
-using namespace std;
-
-template<class H>
-class node {
-public:
- explicit node(H key, node<H>* next) : _key{key}, _next(next) {}
- const H& key() const { return _key; }
- H& key() { return _key; }
- const node<H>*& next() const { return _next; }
- node<H>*& next() { return _next; }
-private:
- H _key;
- node<H>* _next;
-};
-
-template<class H>
-class list {
-public:
- list() : _head{nullptr} {}
- ~list() {
- while(_head) {
- auto tmp = _head;
- _head = _head->next();
- delete tmp;
- }
- }
- list<H>* push(H val) {
- auto iter = _head;
- while(iter && iter->next())
- iter = iter->next();
-
- if(!iter)
- _head = new node<H>{val, nullptr};
- else
- iter->next() = new node<H>{val, nullptr};
-
- return this;
- }
- void print() {
- auto iter = _head;
- while(iter) {
- cout << iter->key() << ' ';
- iter = iter->next();
- }
- }
- vector<H> as_vector() {
- vector<H> v;
- auto iter = _head;
- while(iter) {
- v.push_back(iter->key());
- iter = iter->next();
- }
- return v;
- }
- node<H>* search(H val) {
- auto iter = _head;
- while(iter && iter->key() != val) {
- iter = iter->next();
- }
-
- return iter;
- }
-private:
- node<H>* _head;
-};
-
-template<class H>
-class graph {
-private:
- int _len, _nodes, _edges;
- int* _parents;
- int* _radixes;
- int* _distances;
- int* _finishes;
- int* _colors;
- int _time;
- int _current;
- H** _k; // it works like a dictionary, it saves the keys
- list<int>** _adj;
- int _index(H val) {
- for(int i = 0; i < _nodes; ++i)
- if(*_k[i] == val) return i;
-
- return -1;
- }
- void _dfsvisit(int u) {
- _colors[u] = G;
- _distances[u] = _time++;
- _radixes[u] = _current;
- for(auto const& v : _adj[u]->as_vector()) {
- if(_colors[v] == W) {
- _parents[v] = u;
- _dfsvisit(v);
- }
- }
- _colors[u] = B;
- _finishes[u] = _time++;
- }
-public:
- graph(int len) : _len{len}, _nodes{0}, _edges{0} {
- _k = new H*[len];
- _adj = new list<int>*[_len];
- _parents = new int[_len];
- _radixes = new int[_len];
- _distances = new int[_len];
- _finishes = new int[_len];
- _colors = new int[_len];
- for(int i = 0; i < _len; ++i) {
- _k[i] = nullptr;
- _adj[i] = new list<int>{};
- }
- }
-
- graph<H>* add_node(H k) {
- if(_nodes == _len) return this;
- if(_index(k) >= 0) return this; // node is already there
-
- _k[_nodes++] = new H(k);
-
- return this;
- }
-
-
- void dfs() {
- _time = 0;
- for(int i = 0; i < _nodes; ++i) {
- _colors[i] = W;
- _parents[i] = -1;
- }
-
- for(int i = 0; i < _nodes; ++i) {
- if(_colors[i] == W) {
- _current = i;
- _dfsvisit(i);
- }
- }
- for(int i = 0; i < _nodes; ++i) {
- cout << *_k[i] << "(" << _distances[i]+1 << ',' << _finishes[i]+1 << ")" << endl;
- }
- }
-
- graph<H>* add_edge(H x, H y) {
- int i = _index(x);
- int j = _index(y);
- if(i < 0 || j < 0) return this;
-
- if(!_adj[i]->search(j)) {
- _adj[i]->push(j);
- _edges++;
- }
-
- return this;
- }
-
- void print() {
- for(int i = 0; i < _nodes; ++i) {
- cout << "(" << i << ", " << *_k[i] << "): ";
- for(auto const& j : _adj[i]->as_vector())
- cout << "(" << j << ", " << *_k[j] << "), ";
- cout << '\n';
- }
- }
-};
-
-
-int main() {
- graph<char>* g = new graph<char>(6);
- g->add_node('u')->add_node('v')->add_node('x')->add_node('y');
- g->add_node('w')->add_node('z');
- g->add_edge('u', 'v');
- g->add_edge('u', 'x');
- g->add_edge('x', 'v');
- g->add_edge('y', 'x');
- g->add_edge('v', 'y');
- g->add_edge('w', 'y');
- g->add_edge('w', 'z');
- g->add_edge('z', 'z');
-
- g->print();
- g->dfs();
-
- delete g;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/graph.cc b/I_anno/Programmazione_2/data_structures/graph.cc
deleted file mode 100644
index 12837be..0000000
--- a/I_anno/Programmazione_2/data_structures/graph.cc
+++ /dev/null
@@ -1,164 +0,0 @@
-#include<iostream>
-#include<vector>
-
-using namespace std;
-
-template<class H>
-class node {
-public:
- explicit node(H key, node<H>* next) : _key{key}, _next(next) {}
- const H& key() const { return _key; }
- H& key() { return _key; }
- const node<H>*& next() const { return _next; }
- node<H>*& next() { return _next; }
-private:
- H _key;
- node<H>* _next;
-};
-
-template<class H>
-class list {
-public:
- list() : _head{nullptr} {}
- ~list() {
- while(_head) {
- auto tmp = _head;
- _head = _head->next();
- delete tmp;
- }
- }
- list<H>* push(H val) {
- auto iter = _head;
- while(iter && iter->next())
- iter = iter->next();
-
- if(!iter)
- _head = new node<H>{val, nullptr};
- else
- iter->next() = new node<H>{val, nullptr};
-
- return this;
- }
- list<H>* pop(H val) {
- auto elem = search(val);
- if(!elem)
- return this;
-
- auto iter = _head;
- // This is the case when head is the element we want to pop
- if(iter == elem) {
- delete _head;
- _head = nullptr;
- return this;
- }
-
- while(iter && iter->next() != elem)
- iter = iter->next();
-
- auto tmp = iter->next();
- if(iter->next()->next()) {
- iter->next() = iter->next()->next();
- } else { // the element we want to pop is the tail
- iter->next() = nullptr;
- }
- delete tmp;
-
- return this;
- }
- void print() {
- auto iter = _head;
- while(iter) {
- cout << iter->key() << ' ';
- iter = iter->next();
- }
- }
- vector<H> as_vector() {
- vector<H> v;
- auto iter = _head;
- while(iter) {
- v.push_back(iter->key());
- iter = iter->next();
- }
- return v;
- }
- node<H>* search(H val) {
- auto iter = _head;
- while(iter && iter->key() != val) {
- iter = iter->next();
- }
-
- return iter;
- }
-private:
- node<H>* _head;
-};
-
-template<class H>
-class graph {
-public:
-
-private:
- int _len, _nodes, _edges;
- H **_k;
- list<int> **_adj;
- int _index(H val) {
- for(int i = 0; i < _nodes; ++i)
- if(*_k[i] == val) return i;
-
- return -1;
- }
-public:
- graph(int len) : _len{len}, _nodes{0}, _edges{0} {
- _k = new H*[len];
- _adj = new list<int>*[_len];
- for(int i = 0; i < _len; ++i) {
- _k[i] = nullptr;
- _adj[i] = new list<int>{};
- }
- }
-
- graph<H>* add_node(H k) {
- if(_nodes == _len) return this;
- if(_index(k) >= 0) return this; // node is already there
-
- _k[_nodes++] = new H(k);
-
- return this;
- }
-
- graph<H>* add_edge(H x, H y) {
- int i = _index(x);
- int j = _index(y);
- if(i < 0 || j < 0) return this;
-
- if(!_adj[i]->search(j)) {
- _adj[i]->push(j);
- _edges++;
- }
-
- return this;
- }
-
- void print() {
- for(int i = 0; i < _nodes; ++i) {
- cout << "(" << i << ", " << *_k[i] << "): ";
- for(auto const& j : _adj[i]->as_vector())
- cout << "(" << j << ", " << *_k[j] << "), ";
- cout << '\n';
- }
- }
-};
-
-
-int main() {
- graph<string>* g = new graph<string>(5);
- g->add_node("hello")->add_node("greg")->add_node("yes");
- g->add_node("nop")->add_node("ok");
- g->add_edge("hello", "ok");
- g->add_edge("ok", "yes")->add_edge("yes", "ok")->add_edge("yes", "yes");
- g->add_edge("yes", "nop");
- g->print();
-
- delete g;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/graph_stl.cc b/I_anno/Programmazione_2/data_structures/graph_stl.cc
deleted file mode 100644
index 5381747..0000000
--- a/I_anno/Programmazione_2/data_structures/graph_stl.cc
+++ /dev/null
@@ -1,221 +0,0 @@
-#include<iostream>
-#include<vector>
-#include<algorithm>
-#include<queue>
-#include<stack>
-#define INF 99999999
-#define W -1
-#define G 0
-#define B 1
-
-using namespace std;
-
-template<class H>
-class graph {
-public:
- graph(int len) : _len{len}, _nodes{0}, _edges{0} {
- _k = new H*[len];
- _adj = new vector<int>[len];
- _colors = new int[len];
- _d = new int[len];
- _f = new int[len];
- _p = new int[len];
-
- for(int i = 0; i < len; ++i) {
- _k[i] = nullptr;
- }
- }
- ~graph() {
- delete[] _k;
- delete[] _adj;
- }
-
- graph<H>* add_node(H x) {
- if(_index(x) > -1) return this;
- if(_nodes == _len) return this;
- _k[_nodes++] = new H(x);
-
- return this;
- }
- graph<H>* add_edge(H u, H v) {
- int i = _index(u);
- int j = _index(v);
- if(i < 0 || j < 0) return this;
-
- if(find(_adj[i].begin(), _adj[i].end(), j) == _adj[i].end()) {
- _adj[i].push_back(j);
- }
- return this;
- }
- void print() {
- for(int i = 0; i < _nodes; ++i) {
- cout << "(" << *_k[i] << ", " << i << "): ";
- for(auto const& j : _adj[i]) {
- cout << "(" << *_k[j] << ", " << j << ") ";
- }
- cout << endl;
- }
- }
- void dfsvisit(int u, bool visited[]) {
- visited[u] = true;
- cout << "(" << *_k[u] << ", " << u << ") ";
- for(auto const& i : _adj[u]) {
- if(!visited[i])
- dfsvisit(i, visited);
- }
- }
- int dfsvisit(int u) {
- int cycle = 0;
- _colors[u] = G;
- _d[u] = _time++;
-
- for(auto const& j : _adj[u]) {
- if(_colors[j] == W)
- cycle |= dfsvisit(j);
- }
-
- _colors[u] = B;
- _stack.push(u);
- _f[u] = _time++;
- return cycle;
- }
- int dfs() {
- int cycle = 0;
- for(int i = 0; i < _nodes; ++i) {
- _colors[i] = W;
- }
- _time = 0;
- for(int i = 0; i < _nodes; ++i) {
- if(_colors[i] == W)
- cycle |= dfsvisit(i);
- else if(_colors[i] == G)
- cycle = 1;
- }
- for(int i = 0; i < _nodes; ++i) {
- cout << "(" << *_k[i] << ", " << i << "): [" << _d[i] << "," << _f[i] << "]" << endl;
- }
- return cycle;
- }
-
- void top_sort() {
- int cycle = dfs();
- if(cycle) {
- cout << "cyclic graph!" << endl;
- return;
- }
- int* s = new int[_nodes];
- for(int i = 0; i < _nodes; ++i) s[i] = i;
- _sort(s, _nodes, _f);
- for(int i = 0; i < _nodes; ++i) {
- cout << "(" << s[i] << ", " << _f[s[i]] << ") ";
- }
-
- }
-
- void bfs(H v) {
- int s = _index(v);
- if(s < 0) return;
-
- for(int i = 0; i < _nodes; ++i) {
- _colors[i] = W;
- _d[i] = INF;
- _p[i] = -1;
- }
- _colors[s] = G;
- _d[s] = 0;
- queue<int> q;
- q.push(s);
- while(!q.empty()) {
- int u = q.front();
- q.pop();
- for(auto const& j : _adj[u]) {
- if(_colors[j] == W) {
- _colors[j] = G;
- _d[j] = _d[u]+1;
- _p[j] = u;
- q.push(j);
- }
- }
- _colors[u] = B;
- }
- for(int i = 0; i < _nodes; ++i) {
- cout << "(" << *_k[i] << ", " << i << "): [" << _d[i] << "]" << endl;
- }
- }
- void ssc() {
- dfs();
- cout << endl << endl;
- auto gr = _transpose();
- bool* visited = new bool[_nodes];
- for(int i = 0; i < _nodes; ++i)
- visited[i] = false;
-
- while(!_stack.empty()) {
- int v = _stack.top();
- _stack.pop();
- if(!visited[v]) {
- gr->dfsvisit(v, visited);
- cout << endl;
- }
- }
- delete[] visited;
- }
-private:
- graph<H>* _transpose() {
- graph<H>* g = new graph<H>{_len};
- for(int i = 0; i < _nodes; ++i) {
- g->add_node(*_k[i]);
- }
-
- for(int i = 0; i < _nodes; ++i) {
- for(auto const& j : _adj[i]) {
- g->add_edge(j, i);
- }
- }
-
- return g;
- }
- void _sort(int* d, int n, int* s) {
- for(int i = -1; i < n; ++i) {
- int j = i-1;
- while(j > -1 && s[d[j+1]]>s[d[j]]) {
- swap(d[s[j+1]], d[s[j]]);
- --j;
- }
- }
- }
- int _index(H x) {
- for(int i = 0; i < _nodes; ++i)
- if(*_k[i] == x) return i;
-
- return -1;
- }
- stack<int> _stack;
- H** _k;
- vector<int>* _adj;
- int _len, _nodes, _edges;
- int* _colors;
- int _time;
- int* _d;
- int* _f;
- int* _p;
-};
-
-int main() {
- graph<int>* g = new graph<int>{5};
- for(auto const& i : {0, 1, 2, 3, 4})
- g->add_node(i);
- g->add_edge(1, 0);
- g->add_edge(2, 1);
- g->add_edge(0, 2);
- g->add_edge(0, 3);
- g->add_edge(3, 4);
- //g->print();
- cout << endl;
- //g->top_sort();
- g->ssc();
- cout << endl;
- //g->bfs(0);
- delete g;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/list.cc b/I_anno/Programmazione_2/data_structures/list.cc
deleted file mode 100644
index 8ddcbf9..0000000
--- a/I_anno/Programmazione_2/data_structures/list.cc
+++ /dev/null
@@ -1,164 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<typename T>
-struct node {
- T value;
- node* next;
-};
-
-
-template<typename T>
-class list {
-public:
- list() : _head{nullptr} {}
-
- ~list() {
- while(_head) {
- node<T>* tmp = _head->next;
- delete tmp;
- _head = tmp;
- }
- }
-
- list* push_front(T val) {
- _head = new node<T>{val, _head};
-
- return this;
- }
-
- list* push_back(T val) {
- if(!_head) return this->push_front(val);
-
- node<T>* iter = _head;
- while(iter->next) {
- iter = iter->next;
- }
- iter->next = new node<T>{val, nullptr};
-
- return this;
- }
-
- list* push_after_value(T val, T newval) {
- node<T>* iter = _search(val);
- if(iter)
- iter->next = new node<T>{newval, iter->next};
-
- return this;
- }
-
- list* push_before_value(T val, T newval) {
- node<T>* elem = _search(val);
- if(!elem) return this;
-
- node<T>* iter = _head;
-
- if(iter->value == val)
- return this->push_front(newval);
-
- while(iter->next != elem)
- iter = iter->next;
-
- iter->next = new node<T>{newval, iter->next};
-
- return this;
- }
-
- list* pop(int val) {
- node<T>* elem = _search(val);
- if(!elem) return this;
-
- node<T>* iter = _head;
- if(iter == elem) return this->pop_front();
-
- while(iter->next != elem)
- iter = iter->next;
-
- node<T>* temp = iter->next;
- iter->next = iter->next->next;
- delete temp;
-
- return this;
- }
-
- list* pop_front() {
- if(!_head)
- return this;
-
- node<T>* elem = _head;
- _head = _head->next;
- delete elem;
-
- return this;
- }
-
- list* pop_back() {
- if(!_head)
- return this;
-
- node<T>* iter = _head;
-
- while(iter->next && iter->next->next) {
- iter = iter->next;
- }
-
- if(!iter->next) {
- delete iter;
- _head = nullptr;
- } else if(iter->next->next) {
- delete iter->next->next;
- } else {
- delete iter->next;
- }
-
- iter->next = nullptr;
-
- return this;
- }
-
- void print() {
- node<T>* iter = _head;
- while(iter) {
- cout << iter->value << ' ';
- iter = iter->next;
- }
- }
-private:
- node<T>* _search(T value) {
- node<T>* iter = _head;
- while(iter && iter->value != value)
- iter = iter->next;
-
- return iter;
- }
-
- node<T>* _head;
-};
-
-int main() {
- list<int>* l = new list<int>{};
- l->push_front(2)->push_front(1);
- l->print(); cout << endl;
- l->push_back(5);
- l->print(); cout << endl;
- l->push_back(10)->push_back(15);
- l->print(); cout << endl;
- l->push_after_value(5, 6);
- l->print(); cout << endl;
- l->push_before_value(5, 4);
- l->print(); cout << endl;
- l->push_before_value(4, 3);
- l->print(); cout << endl;
- l->pop_back();
- l->print(); cout << endl;
- l->pop_front();
- l->print(); cout << endl;
- l->push_front(1);
- l->print(); cout << endl;
- l->pop(1);
- l->print(); cout << endl;
-
- delete l;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/list_double.cc b/I_anno/Programmazione_2/data_structures/list_double.cc
deleted file mode 100644
index fa0af26..0000000
--- a/I_anno/Programmazione_2/data_structures/list_double.cc
+++ /dev/null
@@ -1,182 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<typename T>
-struct node {
- T value;
- node* prev;
- node* next;
-};
-
-
-template<typename T>
-class list {
-public:
- list() : _head{nullptr} {}
-
- ~list() {
- while(_head != nullptr) {
- node<T>* tmp = _head->next;
- delete tmp;
- _head = tmp;
- }
- }
-
- list* push_front(T val) {
- if(!_head) {
- _head = new node<T>{val, nullptr, nullptr};
- } else {
- _head = new node<T>{val, nullptr, _head};
- _head->next->prev = _head;
- }
-
- return this;
- }
-
- list* push_back(T val) {
- if(!_head) return this->push_front(val);
-
- node<T>* iter = _head;
- while(iter->next) {
- iter = iter->next;
- }
- iter->next = new node<T>{val, iter, nullptr};
-
- return this;
- }
-
- list* push_after_value(T val, T newval) {
- node<T>* elem = _search(val);
- if(elem) {
- node<T>* nod = new node<T>{newval, elem, elem->next};
- elem->next = nod;
- nod->next->prev = nod;
- }
-
- return this;
- }
-
- list* push_before_value(T val, T newval) {
- node<T>* elem = _search(val);
- if(!elem) return this;
-
- node<T>* iter = _head;
-
- if(iter->value == val)
- return this->push_front(newval);
-
- while(iter->next != elem)
- iter = iter->next;
-
- node<T>* nod = new node<T>{newval, iter, iter->next};
- iter->next = nod;
- nod->next->prev = nod;
-
- return this;
- }
-
- list* pop(int val) {
- node<T>* elem = _search(val);
- if(!elem) return this;
-
- if(elem == _head) return this->pop_front();
-
- node<T>* iter = elem->prev;
- node<T>* temp = iter->next;
- iter->next = iter->next->next;
- iter->next->prev = iter;
- delete temp;
-
- return this;
- }
-
- list* pop_front() {
- if(!_head)
- return this;
-
- node<T>* elem = _head;
- _head = _head->next;
- _head->prev = nullptr;
- delete elem;
-
- return this;
- }
-
- list* pop_back() {
- if(!_head)
- return this;
-
- node<T>* iter = _last()->prev;
-
- if(iter->next == nullptr) {
- delete iter;
- _head = nullptr;
- } else if(iter->next->next) {
- delete iter->next->next;
- } else {
- delete iter->next;
- }
-
- iter->next = nullptr;
-
- return this;
- }
-
- void print() {
- node<T>* iter = _head;
- while(iter) {
- cout << iter->value << ' ';
- cout << "[[ " << (iter->prev!=nullptr ? iter->prev->value : -1) << ", ";
- cout << (iter->next!=nullptr ? iter->next->value : -1) << " ]], ";
- iter = iter->next;
- }
- }
-private:
- node<T>* _last() {
- node<T>* iter = _head;
- while(iter->next) {
- iter = iter->next;
- }
-
- return iter;
- }
-
- node<T>* _search(T value) {
- node<T>* iter = _head;
- while(iter && iter->value != value)
- iter = iter->next;
-
- return iter;
- }
-
- node<T>* _head;
-};
-
-int main() {
- list<int>* l = new list<int>{};
- l->push_front(2)->push_front(1);
- l->print(); cout << endl;
- l->push_back(5);
- l->print(); cout << endl;
- l->push_back(10)->push_back(15);
- l->print(); cout << endl;
- l->push_after_value(5, 6);
- l->print(); cout << endl;
- l->push_after_value(5, 7);
- l->print(); cout << endl;
- l->push_before_value(5, 4);
- l->print(); cout << endl;
- l->push_before_value(5, 3);
- l->print(); cout << endl;
- l->pop_back();
- l->print(); cout << endl;
- l->pop_front();
- l->print(); cout << endl;
- l->pop(2);
- l->print(); cout << endl;
-
- delete l;
-
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/matrix-graph.cc b/I_anno/Programmazione_2/data_structures/matrix-graph.cc
deleted file mode 100644
index a644ec1..0000000
--- a/I_anno/Programmazione_2/data_structures/matrix-graph.cc
+++ /dev/null
@@ -1,81 +0,0 @@
-#include<iostream>
-#include<list>
-
-using namespace std;
-
-template<class H>
-class matrix_graph {
-public:
- ~matrix_graph() {
- delete[] _m;
- delete[] _k;
- }
- matrix_graph(int len) : _len{len}, _nodes{0}, _edges{0} {
- _m = new int*[len];
- _k = new H*[len];
- for(int i = 0; i < len; ++i) {
- _m[i] = new int[len];
- _k[i] = nullptr;
- for(int j = 0; j < len; ++j)
- _m[i][j] = 0;
- }
- }
-
- matrix_graph<H>* add_node(H k) {
- if(_len == _nodes) return this; // no more space for new nodes
- if(_index(k) > -1) return this; // nodes already exists
-
- _k[_nodes++] = new H(k);
-
- return this;
- }
-
- matrix_graph<H>* add_edge(H x, H y) {
- int i = _index(x);
- int j = _index(y);
- if(i < 0 || j < 0) return this;
- if(!_m[i][j]) {
- _m[i][j] = 1;
- _edges++;
- }
- return this;
- }
- void print() {
- for(int i = 0; i < _len; ++i) {
- cout << i << ' ' << *_k[i] << ": ";
- for(int j = 0; j < _len; ++j) {
- if(_m[i][j])
- cout << *_k[j] << ' ';
- }
- cout << '\n';
- }
- cout << endl;
- for(int i = 0; i < _len; ++i) {
- for(int j = 0; j < _len; ++j) {
- cout << _m[i][j] << ' ';
- }
- cout << '\n';
- }
- }
-private:
- int _len, _nodes, _edges;
- int** _m;
- H** _k;
- int _index(H x) {
- for(int i = 0; i < _nodes; ++i)
- if(*_k[i] == x) return i;
- return -1;
- }
-};
-
-int main() {
- matrix_graph<string>* g = new matrix_graph<string>(5);
- g->add_node("hello")->add_node("greg")->add_node("yes");
- g->add_node("nop")->add_node("ok");
- g->add_edge("hello", "ok");
- g->add_edge("ok", "yes")->add_edge("yes", "ok")->add_edge("yes", "yes");
- g->add_edge("yes", "nop");
- g->print();
- delete g;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/queue.cc b/I_anno/Programmazione_2/data_structures/queue.cc
deleted file mode 100644
index 8398459..0000000
--- a/I_anno/Programmazione_2/data_structures/queue.cc
+++ /dev/null
@@ -1,72 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<typename T>
-struct node {
- T value;
- node<T>* next;
-};
-
-template<class T>
-class queue {
-public:
- queue() : _head{nullptr} {}
-
- ~queue() {
- auto iter = _head;
- while(iter) {
- delete iter;
- iter = iter->next;
- }
- }
-
- queue<T>* enqueue(T val) {
-
- if(!_head) {
- _head = new node<T>{val, nullptr};
- _tail = _head;
- } else {
- _tail->next = new node<T>{val, nullptr};
- _tail = _tail->next;
- }
-
- return this;
- }
-
- node<T>* dequeue() {
- if(!_head) return nullptr;
- auto iter = _head;
- delete _head;
- _head = iter->next;
- return iter;
- }
-
- void print() {
- auto iter = _head;
- while(iter) {
- cout << iter->value << ' ';
- iter = iter->next;
- }
- cout << endl;
- }
-private:
- node<T>* _head;
- node<T>* _tail;
-};
-
-int main() {
- queue<int>* q = new queue<int>();
-
- q->dequeue();
- q->enqueue(4)->enqueue(2)->enqueue(8);
- q->print();
- auto e = q->dequeue();
- if(e)
- cout << e->value << endl;
- q->enqueue(1);
- q->print();
-
- delete q;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/queue_w_array.cc b/I_anno/Programmazione_2/data_structures/queue_w_array.cc
deleted file mode 100644
index fb92d68..0000000
--- a/I_anno/Programmazione_2/data_structures/queue_w_array.cc
+++ /dev/null
@@ -1,66 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<class H>
-class queue {
-public:
- queue(int n) : _size{n}, _counter{0}, _head{0}, _tail{0} {
- _arr = new H[n];
- }
- ~queue() {
- delete _arr;
- }
- bool is_empty() {
- return _counter == 0;
- }
- bool is_full() {
- return _counter == _size;
- }
-
- queue<H>* enqueue(H x) {
- if(!is_full()) {
- _arr[_tail] = x;
- if(_tail == _size-1)
- _tail = 0;
- else
- ++_tail;
- _counter++;
- }
-
- return this;
- }
- H dequeue() {
- if(is_empty()) return -1;
- H x = _arr[_head];
-
- if(_head == _size-1)
- _head = 0;
- else
- ++_head;
-
- _counter--;
- return x;
- }
-private:
- H* _arr;
- int _size;
- short _counter;
- short _head;
- short _tail;
-};
-
-int main() {
- queue<int>* q = new queue<int>{4};
- q->enqueue(5)->enqueue(13)->enqueue(3);
- cout << q->dequeue() << '\n';
- q->enqueue(4)->enqueue(6)->enqueue(7);
- q->dequeue();
- q->enqueue(7);
-
- for(int i = 0; i < 6; ++i) {
- cout << q->dequeue() << ' ';
- }
- delete q;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/stack.cc b/I_anno/Programmazione_2/data_structures/stack.cc
deleted file mode 100644
index ffff780..0000000
--- a/I_anno/Programmazione_2/data_structures/stack.cc
+++ /dev/null
@@ -1,70 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<typename T>
-struct node {
- T value;
- node<T>* next;
-};
-
-template<class T>
-class stack {
-public:
- stack() : _head{nullptr} {}
-
- ~stack() {
- auto iter = _head;
- while(iter) {
- delete iter;
- iter = iter->next;
- }
- }
-
- stack<T>* push(T val) {
-
- if(!_head) {
- _head = new node<T>{val, nullptr};
- } else {
- _head = new node<T>{val, _head};
- }
-
- return this;
- }
-
- node<T>* pop() {
- if(!_head) return nullptr;
- node<T>* elem = _head;
- delete _head;
- _head = elem->next;
-
- return elem;
- }
-
- void print() {
- auto iter = _head;
- while(iter) {
- cout << iter->value << ' ';
- iter = iter->next;
- }
- cout << endl;
- }
-private:
- node<T>* _head;
-};
-
-int main() {
- stack<int>* s = new stack<int>();
-
- s->pop();
- s->push(4)->push(2)->push(8);
- s->print();
- auto e = s->pop();
- if(e)
- cout << e->value << endl;
- s->push(1);
- s->print();
-
- delete s;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/stack_w_array.cc b/I_anno/Programmazione_2/data_structures/stack_w_array.cc
deleted file mode 100644
index c20db90..0000000
--- a/I_anno/Programmazione_2/data_structures/stack_w_array.cc
+++ /dev/null
@@ -1,50 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-template<class H>
-class stack {
-public:
- stack(int n) : _size{n}, _top{-1} {
- _arr = new H[n];
- }
- ~stack() {
- delete _arr;
- }
- bool is_empty() {
- return _top == -1;
- }
- bool is_full() {
- return _top == _size-1;
- }
- stack<H>* push(H x) {
- if(!is_full()) {
- _arr[++_top] = x;
- }
- return this;
- }
- H pop() {
- if(is_empty())
- return -1;
- _top--;
- return _arr[_top+1];
- }
-private:
- int _size;
- H* _arr;
- short _top;
-};
-
-int main() {
- stack<int>* s = new stack<int>{7};
-
- s->push(15)->push(6)->push(2)->push(9)->push(17)->push(3);
- cout << s->pop() << '\n';
- s->push(18)->push(19)->push(12);
-
- for(int i = 0; i < 7; ++i)
- cout << s->pop() << ' ';
-
- delete s;
- return 0;
-}
diff --git a/I_anno/Programmazione_2/data_structures/top-sort.cc b/I_anno/Programmazione_2/data_structures/top-sort.cc
deleted file mode 100644
index 7441ee9..0000000
--- a/I_anno/Programmazione_2/data_structures/top-sort.cc
+++ /dev/null
@@ -1,212 +0,0 @@
-
-#include<iostream>
-#include<vector>
-#include<queue>
-#define W -1
-#define G 0
-#define B 1
-
-using namespace std;
-
-template<class H>
-class node {
-public:
- explicit node(H key, node<H>* next) : _key{key}, _next(next) {}
- const H& key() const { return _key; }
- H& key() { return _key; }
- const node<H>*& next() const { return _next; }
- node<H>*& next() { return _next; }
-private:
- H _key;
- node<H>* _next;
-};
-
-template<class H>
-class list {
-public:
- list() : _head{nullptr} {}
- ~list() {
- while(_head) {
- auto tmp = _head;
- _head = _head->next();
- delete tmp;
- }
- }
- list<H>* push(H val) {
- auto iter = _head;
- while(iter && iter->next())
- iter = iter->next();
-
- if(!iter)
- _head = new node<H>{val, nullptr};
- else
- iter->next() = new node<H>{val, nullptr};
-
- return this;
- }
- void print() {
- auto iter = _head;
- while(iter) {
- cout << iter->key() << ' ';
- iter = iter->next();
- }
- }
- vector<H> as_vector() {
- vector<H> v;
- auto iter = _head;
- while(iter) {
- v.push_back(iter->key());
- iter = iter->next();
- }
- return v;
- }
- node<H>* search(H val) {
- auto iter = _head;
- while(iter && iter->key() != val) {
- iter = iter->next();
- }
-
- return iter;
- }
-private:
- node<H>* _head;
-};
-
-template<class H>
-class graph {
-private:
- int _len, _nodes, _edges;
- int* _parents;
- int* _radixes;
- int* _distances;
- int* _finishes;
- int* _colors;
- int _time;
- int _current;
- H** _k; // it works like a dictionary, it saves the keys
- list<int>** _adj;
- int _index(H val) {
- for(int i = 0; i < _nodes; ++i)
- if(*_k[i] == val) return i;
-
- return -1;
- }
- bool _dfsvisit(int u) {
- bool cycle = false;
- _colors[u] = G;
- _distances[u] = _time++;
- _radixes[u] = _current;
- for(auto const& v : _adj[u]->as_vector()) {
- if(_colors[v] == W) {
- _parents[v] = u;
- _dfsvisit(v);
- } else if(_colors[v] == G) {
- cycle = true;
- }
- }
- _colors[u] = B;
- _finishes[u] = _time++;
- return cycle;
- }
-public:
- graph(int len) : _len{len}, _nodes{0}, _edges{0} {
- _k = new H*[len];
- _adj = new list<int>*[_len];
- _parents = new int[_len];
- _radixes = new int[_len];
- _distances = new int[_len];
- _finishes = new int[_len];
- _colors = new int[_len];
- for(int i = 0; i < _len; ++i) {
- _k[i] = nullptr;
- _adj[i] = new list<int>{};
- }
- }
-
- graph<H>* add_node(H k) {
- if(_nodes == _len) return this;
- if(_index(k) >= 0) return this; // node is already there
-
- _k[_nodes++] = new H(k);
-
- return this;
- }
-
-
- bool dfs() {
- bool cycle = 0;
- _time = 0;
- for(int i = 0; i < _nodes; ++i) {
- _colors[i] = W;
- _parents[i] = -1;
- }
-
- for(int i = 0; i < _nodes; ++i) {
- if(_colors[i] == W) {
- _current = i;
- cycle |= _dfsvisit(i);
- }
- }
- for(int i = 0; i < _nodes; ++i) {
- cout << *_k[i] << "(" << _distances[i]+1 << ',' << _finishes[i]+1 << ")" << endl;
- }
- return cycle;
- }
-
- void top_sort() {
- bool cycle = dfs();
- if(cycle) {
- cerr << "Grafo ciclico\n";
- return;
- }
- vector<int> s(_finishes, _finishes+_nodes);
- sort(begin(s), end(s));
- for(auto const& i : s) {
- cout << "(" << i << ", " << _finishes[i] << ") ";
- }
- }
-
- graph<H>* add_edge(H x, H y) {
- int i = _index(x);
- int j = _index(y);
- if(i < 0 || j < 0) return this;
-
- if(!_adj[i]->search(j)) {
- _adj[i]->push(j);
- _edges++;
- }
-
- return this;
- }
-
- void print() {
- for(int i = 0; i < _nodes; ++i) {
- cout << "(" << i << ", " << *_k[i] << "): ";
- for(auto const& j : _adj[i]->as_vector())
- cout << "(" << j << ", " << *_k[j] << "), ";
- cout << '\n';
- }
- }
-};
-
-
-int main() {
- graph<char>* g = new graph<char>(6);
- g->add_node('u')->add_node('v')->add_node('x')->add_node('y');
- g->add_node('w')->add_node('z');
- g->add_edge('u', 'v');
- g->add_edge('u', 'x');
- g->add_edge('x', 'v');
- g->add_edge('y', 'x');
- g->add_edge('v', 'y');
- g->add_edge('w', 'y');
- g->add_edge('w', 'z');
- g->add_edge('z', 'z');
-
- g->print();
- g->dfs();
- g->top_sort();
-
- delete g;
- return 0;
-}
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