From bc8b5b446a6a2d37bae82e7ad20e31e1439a2f0b Mon Sep 17 00:00:00 2001
From: Santo Cariotti <dcariotti24@gmail.com>
Date: Sun, 24 May 2020 16:58:23 +0200
Subject: feat: add more exercises

---
 I_anno/Programmazione_2/exercises/dequeue.cc   | 137 +++++++++++++++++++++++++
 I_anno/Programmazione_2/exercises/doppioni.cc  |  77 ++++++++++++++
 I_anno/Programmazione_2/exercises/pop-stack.cc | 132 ++++++++++++++++++++++++
 3 files changed, 346 insertions(+)
 create mode 100644 I_anno/Programmazione_2/exercises/dequeue.cc
 create mode 100644 I_anno/Programmazione_2/exercises/doppioni.cc
 create mode 100644 I_anno/Programmazione_2/exercises/pop-stack.cc

(limited to 'I_anno/Programmazione_2/exercises')

diff --git a/I_anno/Programmazione_2/exercises/dequeue.cc b/I_anno/Programmazione_2/exercises/dequeue.cc
new file mode 100644
index 0000000..4b012c4
--- /dev/null
+++ b/I_anno/Programmazione_2/exercises/dequeue.cc
@@ -0,0 +1,137 @@
+
+#include<iostream>
+#include<fstream>
+
+using namespace std;
+
+template<class T>
+class node {
+public:
+    node(T key, node<T>* next) : _key{key}, _next{next} {}
+    node(T key) : _key{key}, _next{nullptr} {}
+    const T& key() const { return _key; }
+    T& key() { return _key; }
+    const node<T>*& next() const { return _next; }
+    node<T>*& next() { return _next; }
+private:
+    T _key;
+    node<T>* _next;
+};
+
+template<class T>
+class Coda {
+public:
+    Coda() : _head{nullptr}, _tail{nullptr} {}
+    ~Coda() {
+
+    }
+    Coda<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;
+        node<T>* elem = _head;
+        delete _head;
+        _head = elem->next();
+
+        return elem;
+    }
+
+    bool is_empty() { return _head == nullptr; }
+private:
+    node<T>* _head;
+    node<T>* _tail;
+};
+
+int main() {
+    ifstream in("input.txt");
+    ofstream out("output.txt");
+
+    for(int ts = 0; ts < 100; ++ts) {
+        string t;
+        int n;
+        in >> t;
+        switch(t.at(0)) {
+        case 'b': {
+            Coda<bool>* queue = new Coda<bool>{};
+            in >> n;
+            string s;
+            for(int i = 0; i < n; ++i) {
+                in >> s;
+                if(s.at(0) == 'i') {
+                    queue->enqueue(s.at(1) - '0');
+                } else {
+                    queue->dequeue();
+                }
+            }
+            while(!queue->is_empty())
+                out << queue->dequeue()->key() << ' ';
+            out << endl;
+            break;
+        }
+        case 'd': {
+            Coda<double>* queue = new Coda<double>{};
+            in >> n;
+            string s;
+            for(int i = 0; i < n; ++i) {
+                in >> s;
+                if(s.at(0) == 'i') {
+                    queue->enqueue(stod(s.substr(1, s.length()-1)));
+                } else {
+                    queue->dequeue();
+                }
+            }
+            while(!queue->is_empty())
+                out << queue->dequeue()->key() << ' ';
+            out << endl;
+            break;
+        }
+        case 'c': {
+            Coda<char>* queue = new Coda<char>{};
+            in >> n;
+            string s;
+            for(int i = 0; i < n; ++i) {
+                in >> s;
+                if(s.at(0) == 'i') {
+                    queue->enqueue(s.at(1));
+                } else {
+                    queue->dequeue();
+                }
+            }
+            while(!queue->is_empty())
+                out << queue->dequeue()->key() << ' ';
+            out << endl;
+            break;
+        }
+        case 'i': {
+            Coda<int>* queue = new Coda<int>{};
+            in >> n;
+            string s;
+            for(int i = 0; i < n; ++i) {
+                in >> s;
+                if(s.at(0) == 'i') {
+                    queue->enqueue(stoi(s.substr(1, s.length()-1)));
+                } else {
+                    queue->dequeue();
+                }
+            }
+            while(!queue->is_empty())
+                out << queue->dequeue()->key() << ' ';
+            out << endl;
+            break;
+        }
+        }
+    }
+    in.close();
+    out.close();
+    return 0;
+}
+
diff --git a/I_anno/Programmazione_2/exercises/doppioni.cc b/I_anno/Programmazione_2/exercises/doppioni.cc
new file mode 100644
index 0000000..fdd3e88
--- /dev/null
+++ b/I_anno/Programmazione_2/exercises/doppioni.cc
@@ -0,0 +1,77 @@
+#include<iostream>
+#include<fstream>
+
+using namespace std;
+
+template<class T>
+class node {
+public:
+    node(T key, node* parent, node* right, node* left) : _key{key}, _parent{parent}, _right{right}, _left{left} {}
+    T& key() { return _key; }
+    const T& key() const { return _key; }
+    node<T>*& parent() { return _parent; }
+    const node<T>*& parent() const { return _parent; }
+    node<T>*& right() { return _right; }
+    const node<T>*& right() const { return _right; }
+    node<T>*& left() { return _left; }
+    const node<T>*& left() const { return _left; }
+private:
+    T _key;
+    node<T>* _parent;
+    node<T>* _right;
+    node<T>* _left;
+};
+
+class bst {
+public:
+    bst() : _duplicates{0}, _root{nullptr} {}
+    bst* add(int val) {
+        node<int>* iter = _root;
+        node<int>* prev = nullptr;
+        while(iter) {
+            prev = iter;
+            if(iter->key() == val) {
+                _duplicates++;
+                return this;
+            }
+
+            if(iter->key() > val)
+                iter = iter->right();
+            else
+                iter = iter->left();
+        }
+
+        node<int>* nodus = new node<int>{val, prev, nullptr, nullptr};
+        if(!prev)
+            _root = nodus;
+        else if(prev->key() > val)
+            prev->right() = nodus;
+        else
+            prev->left() = nodus;
+
+        return this;
+    }
+    const int& duplicates() const { return _duplicates; }
+private:
+    int _duplicates;
+    node<int>* _root;
+};
+
+int main() {
+    ifstream in("input.txt");
+    ofstream out("output.txt");
+    for(int ts = 0; ts < 100; ++ts) {
+        bst* b = new bst{};
+        int n;
+        in >> n;
+        int e;
+        for(int i = 0; i < n; ++i) {
+            in >> e;
+            b->add(e);
+        }
+        out << b->duplicates() << endl;
+    }
+    in.close();
+    out.close();
+    return 0;
+}
diff --git a/I_anno/Programmazione_2/exercises/pop-stack.cc b/I_anno/Programmazione_2/exercises/pop-stack.cc
new file mode 100644
index 0000000..3739450
--- /dev/null
+++ b/I_anno/Programmazione_2/exercises/pop-stack.cc
@@ -0,0 +1,132 @@
+#include<iostream>
+#include<fstream>
+
+using namespace std;
+
+template<class T>
+class node {
+public:
+    node(T key, node<T>* next) : _key{key}, _next{next} {}
+    node(T key) : _key{key}, _next{nullptr} {}
+    const T& key() const { return _key; }
+    T& key() { return _key; }
+    const node<T>*& next() const { return _next; }
+    node<T>*& next() { return _next; }
+private:
+    T _key;
+    node<T>* _next;
+};
+
+template<class T>
+class Pila {
+public:
+    Pila() : _head{nullptr}{}
+    ~Pila() {
+
+    }
+    Pila<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;
+    }
+
+    bool is_empty() { return _head == nullptr; }
+private:
+    node<T>* _head;
+};
+
+int main() {
+    ifstream in("input.txt");
+    ofstream out("output.txt");
+
+    for(int ts = 0; ts < 100; ++ts) {
+        string t;
+        int n;
+        in >> t;
+        switch(t.at(0)) {
+        case 'b': {
+            Pila<bool>* stack = new Pila<bool>{};
+            in >> n;
+            string s;
+            for(int i = 0; i < n; ++i) {
+                in >> s;
+                if(s.at(0) == 'i') {
+                    stack->push(s.at(1) - '0');
+                } else {
+                    stack->pop();
+                }
+            }
+            while(!stack->is_empty())
+                out << stack->pop()->key() << ' ';
+            out << endl;
+            break;
+        }
+        case 'd': {
+            Pila<double>* stack = new Pila<double>{};
+            in >> n;
+            string s;
+            for(int i = 0; i < n; ++i) {
+                in >> s;
+                if(s.at(0) == 'i') {
+                    stack->push(stod(s.substr(1, s.length()-1)));
+                } else {
+                    stack->pop();
+                }
+            }
+            while(!stack->is_empty())
+                out << stack->pop()->key() << ' ';
+            out << endl;
+            break;
+        }
+        case 'c': {
+            Pila<char>* stack = new Pila<char>{};
+            in >> n;
+            string s;
+            for(int i = 0; i < n; ++i) {
+                in >> s;
+                if(s.at(0) == 'i') {
+                    stack->push(s.at(1));
+                } else {
+                    stack->pop();
+                }
+            }
+            while(!stack->is_empty())
+                out << stack->pop()->key() << ' ';
+            out << endl;
+            break;
+        }
+        case 'i': {
+            Pila<int>* stack = new Pila<int>{};
+            in >> n;
+            string s;
+            for(int i = 0; i < n; ++i) {
+                in >> s;
+                if(s.at(0) == 'i') {
+                    stack->push(stoi(s.substr(1, s.length()-1)));
+                } else {
+                    stack->pop();
+                }
+            }
+            while(!stack->is_empty())
+                out << stack->pop()->key() << ' ';
+            out << endl;
+            break;
+        }
+        }
+    }
+    in.close();
+    out.close();
+    return 0;
+}
-- 
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