From f279107065146a4940f5e73602a1c3c09e58b31d Mon Sep 17 00:00:00 2001
From: Santo Cariotti <dcariotti24@gmail.com>
Date: Sun, 18 Oct 2020 18:56:43 +0200
Subject: chore: name of first year folder

---
 .../Programmazione_2/data_structures/top-sort.cc   | 212 ---------------------
 1 file changed, 212 deletions(-)
 delete mode 100644 I_anno/Programmazione_2/data_structures/top-sort.cc

(limited to 'I_anno/Programmazione_2/data_structures/top-sort.cc')

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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