restructure and add ipi texs

ws2019/ipi/uebungen/cpp_headers/UseHeap.cc

@@ -0,0 +1,23 @@
+#include<vector>
+#include<iostream>
+
+#include"Heap.hh"
+#include"Zufall.cc"
+
+int main ()
+{
+  Zufall z(87123);
+  Heap<int> h;
+
+  for (int i=0; i<10; i=i+1) {
+    int k = z.ziehe_zahl();
+    std::cout << k << std::endl;
+    h.push(k);
+    if (i==5) h.pop();
+  }
+  std::cout << std::endl;
+  while (!h.empty()) {
+    std::cout << h.top() << std::endl;
+    h.pop();
+  }
+}