Infinate Heap.

main.cpp

@@ -3,6 +3,7 @@
 #include <algorithm>
 #include <map>
 #include <iomanip>
+#include <vector>
 
 using string = std::string;
 using slist = std::list<string>;
@@ -19,28 +20,99 @@ void printlm(T m){
   printm("\n");
 }
 
+class Heap {
+protected:
+  int pos {0};
+  int length {0};
+  Heap() {}
+private:
+  int size;
+  int* storage;
+public:
+  Heap(int sz) {
+    size = sz;
+    storage = new int[sz];
+  }
+  virtual ~Heap() {
+    delete[] storage;
+  }
+  bool isEmpty() {
+    return length == 0;
+  }
+  virtual void add(int item) {
+    if (length + 1 > size) return;
+    pos = length;
+    while (pos > 0 && storage[(pos-1)/2] < item) {
+      storage[pos] = storage[(pos-1)/2];
+      pos = (pos-1)/2;
+    }
+    storage[pos] = item;
+    ++length;
+  }
+  virtual int extractMax() {
+    int max {storage[0]};
+    storage[0] = storage[--length];
+    int first {0};
+    while ((2*first)+1 <= length - 1) {
+      int largest {(2*first)+1};
+      if ((2*first)+2 <= length - 1 && storage[largest] < storage[(2*first)+2]) largest = (2*first)+2;
+      if (storage[first] >= storage[largest]) break;
+      int swap = storage[first];
+      storage[first] = storage[largest];
+      storage[largest] = swap;
+      first = largest;
+    }
+    return max;
+  }
+};
+
+class HeapInf : public Heap {
+  std::vector<int> storage;
+public:
+  HeapInf() : Heap() {}
+  virtual ~HeapInf() {}
+  void add(int item) {
+    if (length+1>storage.size()) storage.push_back(0);
+    pos = length;
+    while (pos > 0 && storage[(pos-1)/2] < item) {
+      storage[pos] = storage[(pos-1)/2];
+      pos = (pos-1)/2;
+    }
+    storage[pos] = item;
+    ++length;
+  }
+  int extractMax() {
+    int max {(storage.size() > 0) ? storage[0] : 0};
+    storage[0] = storage[--length];
+    int first {0};
+    while ((2*first)+1 <= length - 1) {
+      int largest {(2*first)+1};
+      if ((2*first)+2 <= length - 1 && storage[largest] < storage[(2*first)+2]) largest = (2*first)+2;
+      if (storage[first] >= storage[largest]) break;
+      int swap = storage[first];
+      storage[first] = storage[largest];
+      storage[largest] = swap;
+      first = largest;
+    }
+    storage.pop_back();
+    return max;
+  }
+};
+
 int prompti(string,bool*);
-int prompti(string,bool*);
+double promptd(string,bool*);
 string prompts(string,bool*);
 
 int main() {
-  printlm("Parse comma deliminated list:");
-  bool s {};
-  slist lst {};
-  auto v = prompts("Enter the string: ", &s);
-  if (!s) {
-    printlm("Error, No Data!");
-    return -1;
+  printlm("Create Heap:");
+  HeapInf h{};
+  bool s{true};
+  while (s) {
+    auto x {prompti("Enter integer (Finish by entering invalid): ",&s)};
+    if (s) {h.add(x);}
   }
-  auto comma = find(v.cbegin(),v.cend(),',');
-  lst.push_back(string(v.cbegin(),comma));
-  do {
-    auto start = ++comma;
-    comma = find(start,v.cend(),',');
-    lst.push_back(string(start, comma));
-  } while(comma != v.cend());
-  printlm("All entries:");
-  for (const auto c : lst) printlm(c);
+  printlm("Output Heap:");
+  while (!h.isEmpty()) printlm(h.extractMax());
   return 0;
 }