From de5ca5955666edafb86e2e89f9b0774834939bec Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Fri, 13 Jan 2023 18:59:46 +0100
Subject: Add min-enqueue

---
 Year_2/Algorithms/min-enqueue.cc | 125 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 Year_2/Algorithms/min-enqueue.cc

(limited to 'Year_2/Algorithms/min-enqueue.cc')

diff --git a/Year_2/Algorithms/min-enqueue.cc b/Year_2/Algorithms/min-enqueue.cc
new file mode 100644
index 0000000..d6c9db5
--- /dev/null
+++ b/Year_2/Algorithms/min-enqueue.cc
@@ -0,0 +1,125 @@
+#include <cmath>
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+
+template <class H>
+class MinHeap {
+public:
+    MinHeap<H>*
+    enqueue(H key)
+    {
+        if (_size == _n)
+            return this;
+        ++_size;
+        _A[_size] = key;
+
+        int i = _size;
+        int j = i / 2;
+
+        while (i > 1 && _A[i] < _A[j]) {
+            swap(i, j);
+            i = j;
+            j /= 2;
+        }
+
+        return this;
+    }
+
+    size_t
+    left(int i)
+    {
+        return i * 2;
+    }
+    size_t
+    right(int i)
+    {
+        return i * 2 + 1;
+    }
+
+    ~MinHeap()
+    {
+        delete _A;
+    }
+
+    MinHeap(H* A, int size, ostream& out)
+        : _n(size + 1)
+    {
+        _A = new H[_n];
+        for (int i = 0; i < size; ++i) {
+            enqueue(A[i]);
+        }
+
+        for (int i = 1; i <= size; ++i) {
+            out << _A[i] << ' ';
+        }
+        out << endl;
+    }
+
+    void
+    swap(int x, int y)
+    {
+        auto t = _A[x];
+        _A[x] = _A[y];
+        _A[y] = t;
+    }
+
+private:
+    H* _A;
+    size_t _size;
+    size_t _n;
+};
+
+int
+main(int argc, char** argv)
+{
+    ifstream fin("input.txt");
+    ofstream fout("output.txt");
+    string t;
+    int n, j;
+
+    for (int i = 0; i < atoi(argv[1]); ++i) {
+        fin >> t;
+        fin >> n;
+
+        if (t == "bool") {
+            bool* arr = new bool[n];
+            for (j = 0; j < n; ++j)
+                fin >> arr[j];
+
+            MinHeap<bool>* mh = new MinHeap<bool>(arr, n, fout);
+
+            delete mh;
+        } else if (t == "double") {
+            double* arr = new double[n];
+            for (j = 0; j < n; ++j)
+                fin >> arr[j];
+
+            MinHeap<double>* mh = new MinHeap<double>(arr, n, fout);
+
+            delete mh;
+        } else if (t == "char") {
+            char* arr = new char[n];
+            for (j = 0; j < n; ++j)
+                fin >> arr[j];
+
+            MinHeap<char>* mh = new MinHeap<char>(arr, n, fout);
+
+            delete mh;
+        } else if (t == "int") {
+            int* arr = new int[n];
+            for (j = 0; j < n; ++j)
+                fin >> arr[j];
+
+            MinHeap<int>* mh = new MinHeap<int>(arr, n, fout);
+
+            delete mh;
+        }
+    }
+
+    fin.close();
+    fout.close();
+    return 0;
+}
-- 
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