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- import java.io.BufferedReader;
- import java.io.InputStreamReader;
- import java.util.NoSuchElementException;
- interface Stack<E> {
- // Elementi na stekot se objekti od proizvolen tip.
- // Metodi za pristap:
- public boolean isEmpty ();
- // Vrakja true ako i samo ako stekot e prazen.
- public E peek ();
- // Go vrakja elementot na vrvot od stekot.
- // Metodi za transformacija:
- public void clear ();
- // Go prazni stekot.
- public void push (E x);
- // Go dodava x na vrvot na stekot.
- public E pop ();
- // Go otstranuva i vrakja elementot shto e na vrvot na stekot.
- }
- class ArrayStack<E> implements Stack<E> {
- // Stekot e pretstaven na sledniot nacin:
- //depth e dlabochinata na stekot, a
- // elems[0...depth-1] se negovite elementi.
- private E[] elems;
- private int depth;
- @SuppressWarnings("unchecked")
- public ArrayStack (int maxDepth) {
- // Konstrukcija na nov, prazen stek.
- elems = (E[]) new Object[maxDepth];
- depth = 0;
- }
- public boolean isEmpty () {
- // Vrakja true ako i samo ako stekot e prazen.
- return (depth == 0);
- }
- public E peek () {
- // Go vrakja elementot na vrvot od stekot.
- if (depth == 0)
- throw new NoSuchElementException();
- return elems[depth-1];
- }
- public void clear () {
- // Go prazni stekot.
- for (int i = 0; i < depth; i++) elems[i] = null;
- depth = 0;
- }
- public void push (E x) {
- // Go dodava x na vrvot na stekot.
- elems[depth++] = x;
- }
- public E pop () {
- // Go otstranuva i vrakja elementot shto e na vrvot na stekot.
- if (depth == 0)
- throw new NoSuchElementException();
- E topmost = elems[--depth];
- elems[depth] = null;
- return topmost;
- }
- }
- public class CheckHML {
- public static void main(String[] args) throws Exception{
- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
- String s = br.readLine();
- int n = Integer.parseInt(s);
- String [] redovi = new String[n];
- for(int i=0;i<n;i++)
- redovi[i] = br.readLine();
- int valid;
- // Vasiot kod tuka
- // Moze da koristite dopolnitelni funkcii ako vi se potrebni
- ArrayStack<String> magacin = new ArrayStack<String>(n);
- for(int i = 0; i<n; i++)
- {
- if(redovi[i].charAt(0)=='[' && redovi[i].charAt(1)!='/')
- magacin.push(redovi[i]);
- else
- if(redovi[i].charAt(0)=='[' && redovi[i].charAt(1)=='/')
- {
- String p = magacin.peek();
- if(redovi[i].substring(2, redovi[i].length()).compareTo(p.substring(1, p.length())) == 0)
- magacin.pop();
- }
- }
- if(magacin.isEmpty())
- valid = 1;
- else
- valid = 0;
- System.out.println(valid);
- br.close();
- }
- }
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