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Diffstat (limited to '1_anno/Programmazione_2/exercises/exam_20_07_20/ex3.cpp')
| -rw-r--r-- | 1_anno/Programmazione_2/exercises/exam_20_07_20/ex3.cpp | 284 |
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; +} + |