chore: name of first year folder

1 files changed, 284 insertions, 0 deletions

diff --git a/1_anno/Programmazione_2/exercises/exam_20_07_20/ex3.cpp b/1_anno/Programmazione_2/exercises/exam_20_07_20/ex3.cpp
new file mode 100644
index 0000000..71f9c65
--- /dev/null
+++ b/1_anno/Programmazione_2/exercises/exam_20_07_20/ex3.cpp
@@ -0,0 +1,284 @@
+#include<iostream>
+#include<sstream>
+#include<fstream>
+
+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} , _val{0}{}
+
+    ~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->_inorder(os, tree->root);
+        return os;
+    }
+    T sol(T k) {
+        return _max(search(k))->key;
+    }
+private:
+    int _val;
+    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) {
+            if(root->right && root->left) {
+                _val++;
+            }
+            _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() {
+    ifstream in("input.txt");
+    ofstream out("output.txt");
+
+    for(int ts = 0; ts < 100; ++ts) {
+        string t, comm;
+        in >> t;
+        int n;
+        switch(t.at(0)) {
+        case 'd':
+            {
+                bst<double>* b = new bst<double>{};
+                in >> n;
+                double k;
+                for(int i = 0; i < n; ++i) {
+                    in >> comm;
+                    stringstream tcomm(comm);
+                    int ex= 0;
+                    while(getline(tcomm, comm, ':')) {
+                        if(ex == 0) {
+                            if(comm == "ins")
+                                ex = 1;
+                            else
+                                ex = 2;
+                        } else {
+                            if(ex == 1)
+                                b->insert(stod(comm));
+                            else
+                                b->remove(stod(comm));
+                            ex = 0;
+                        }
+                    }
+                }
+                in >> k;
+                cout << b << endl;
+                out << b->sol(k) << endl;
+ 
+                delete b;
+                break;
+            }
+        case 'i':
+            {
+                bst<int>* b = new bst<int>{};
+                in >> n;
+                int k;
+                for(int i = 0; i < n; ++i) {
+                    in >> comm;
+                    stringstream tcomm(comm);
+                    int ex= 0;
+                    while(getline(tcomm, comm, ':')) {
+                        if(ex == 0) {
+                            if(comm == "ins")
+                                ex = 1;
+                            else
+                                ex = 2;
+                        } else {
+                            if(ex == 1)
+                                b->insert(stoi(comm));
+                            else
+                                b->remove(stoi(comm));
+                            ex = 0;
+                        }
+                    }
+                }
+                in >> k;
+                cout << b << endl;
+                out << b->sol(k) << endl;
+ 
+                delete b;
+                break;
+            }
+        }
+    }
+
+    in.close();
+    out.close();
+    return 0;
+}
+