import java.util.Scanner;

class ListNode { // 노드 구성하는 클래스

int coef;
int expo;
ListNode next;

public ListNode() {
    next = null;
}

public ListNode(int coef, int expo) {
    this.coef = coef;
    this.expo = expo;
    this.next = null;
}

}

class Polynomial { // 다항식을 구성하는 클래스

ListNode head;
char name;
int numOfTerms = 0;
Scanner in = new Scanner(System.in);

public Polynomial(char name,int numOfTerm) { 
    head = null;
    this.name = name;
    this.numOfTerms = numOfTerm;
    for (int i = 1 ; i<= numOfTerm; i++) {
        int coef = in.nextInt();
        int expo = in.nextInt();
        insertNode(coef,expo);
    }

}

public Polynomial() {
}

public void insertNode(int coef, int expo) { // 입력받은 정수로 항을 추가하는 메서드
    ListNode node = new ListNode(coef,expo); 
    if(head==null)  
        head = node; 
    else {          
        ListNode current = head; 
        while(current.next!=null) { 
            current = current.next;
        }
        current.next = node;
    }
}

public void print() { // 항개수와 각 항의 계수와 지수를 출력하는 메서드
        System.out.println(numOfTerms);
        ListNode current = head;
        while (current.next!=null) {
            System.out.printf("%d %d\n",current.coef,current.expo   );
            current = current.next;
        }
        System.out.printf("%d %d\n",current.coef, current.expo);
        System.out.println();
    }

}

public class Main { // Main 클래스

Scanner in = new Scanner(System.in);
static Polynomial [] polys = new Polynomial [101];
int n = 0;
static Polynomial c1 = new Polynomial();

public void Main() {        
}

public void CreatePolynomial () {
    char name = in.next().charAt(0);
    int numOfTerm = in.nextInt();
    Polynomial p = new Polynomial(name,numOfTerm);
    polys[n++] = p;
}

public static Polynomial AddPolynomial(Polynomial A,Polynomial B) {
    ListNode a = A.head;
    ListNode b = B.head;
    Polynomial C = new Polynomial();

    while(a!=null && b!=null) {
        if(a.expo<b.expo) {
            C.insertNode(b.coef, b.expo);
            C.numOfTerms += 1;
            b = b.next;
        }
        else if(a.expo > b.expo) {
            C.insertNode(a.coef, a.expo);
            C.numOfTerms += 1;
            a = a.next;
        }
        else {
            if (a.coef+b.coef == 0) {
                a = a.next;
                b = b.next;
            }
            else {
                C.insertNode(a.coef+b.coef,a.expo);
                C.numOfTerms += 1;
                a = a.next;
                b = b.next;
                }
        }
    }
    while (a!=null) {
        C.insertNode(a.coef,a.expo);
        C.numOfTerms += 1;
        a = a.next;
    }

    while (b!=null) {
        C.insertNode(b.coef, b.expo);
        C.numOfTerms += 1;
        b = b.next;
    }

    return C;
}
public void processCommand() {
    Scanner in = new Scanner(System.in);
    int PolyNum = Integer.parseInt(in.next());

    for (int i = 1; i <=PolyNum ; i++)
        CreatePolynomial();

    for (int i = 0; i <= PolyNum-1 ; i++) {
        c1 = AddPolynomial(c1,polys[i]);
    }

    c1.print();
}
public static void main(String[] args) {
    Main app = new Main();
    app.processCommand();

}

}

다항식을 덧셈해서 결과를 출력하는 프로그램인데... 제가 eclipse에서 돌릴때는 잘 되다가 컴파일 사이트에 들어가서 컴파일하면 NoSuchElementException 이라고 자꾸 뜨네요.... ㅠㅠ 몇시간째 해결해보려했는데 도저히 안될것같아서 질문드립니다....