upload

3/E.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+
+struct Node {
+  Node* next;
+  int message;
+};
+
+class Stack {
+ private:
+  Node* first = nullptr;
+
+ public:
+  void Add(int message) {
+    Node* new_node = new Node{first, message};
+    first = new_node;
+  };
+
+  int Poop() {
+    Node* last = first;
+    int return_value = last->message;
+    first = last->next;
+    delete last;
+    return return_value;
+  }
+};
+
+int main() {
+  char* formula = new char[10000];
+  int idx = 0;
+
+  while ((formula[idx] = static_cast<char>(std::cin.get()))) {
+    if (formula[idx] == '\n')
+      break;
+    ++idx;
+  }
+
+  for (int i = 0; i < idx; ++i) {
+    std::cout << formula[i];
+  }
+
+  return 0;
+}