import java.util.Scanner;
public class Inventory {
public static void main (String[] args) {
Scanner scnr = new Scanner(System.in);
InventoryNode headNode;
InventoryNode currNode;
InventoryNode lastNode;
String item;
int numberOfItems;
int i;
// Front of nodes list
headNode = new InventoryNode();
lastNode = headNode;
int input = scnr.nextInt();
for(i = 0; i < input; i++ ) {
item = scnr.next();
numberOfItems = scnr.nextInt();
currNode = new InventoryNode(item, numberOfItems);
currNode.insertAtFront(headNode, currNode);
lastNode = currNode;
}
// Print linked list
currNode = headNode.getNext();
while (currNode != null) {
currNode.printNodeData();
currNode = currNode.getNext();
}
}
}
public class InventoryNode {
private String item;
private int numberOfItems;
private InventoryNode nextNodeRef; // Reference to the next node
public InventoryNode() {
item = "";
numberOfItems = 0;
nextNodeRef = null;
}
// Constructor
public InventoryNode(String itemInit, int numberOfItemsInit) {
this.item = itemInit;
this.numberOfItems = numberOfItemsInit;
this.nextNodeRef = null;
}
// Constructor
public InventoryNode(String itemInit, int numberOfItemsInit, InventoryNode nextLoc) {
this.item = itemInit;
this.numberOfItems = numberOfItemsInit;
this.nextNodeRef = nextLoc;
}
// TODO: Define an insertAtFront() method that inserts a node at the
// front of the linked list (after the dummy head node)
// Get location pointed by nextNodeRef
public InventoryNode getNext() {
return this.nextNodeRef;
}
// Print node data
public void printNodeData() {
System.out.println(this.numberOfItems + " " + this.item);
}
}
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