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Parenteses.java
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Parenteses.java
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import java.util.LinkedList;
import java.util.Scanner;
import java.util.Stack;
class Parenteses {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String[] entrada = scan.nextLine().split("");
LinkedList<String> sequenciaList = new LinkedList<String>();
for (String elemento : entrada) {
sequenciaList.add(elemento);
}
if (sequenciaValida(sequenciaList)) {
System.out.println("S");
} else {
System.out.println("N");
}
scan.close();
}
private static boolean sequenciaValida(LinkedList<String> sequencia) {
if (sequencia.size() % 2 != 0 || !sequencia.peekFirst().equals("("))
return false;
Stack<String> pilha = new Stack<String>();
boolean result = true;
int i = 0;
while (result && i < sequencia.size()) {
if (sequencia.get(i).equals(")") && pilha.isEmpty()) {
result = false;
}
else if (sequencia.get(i).equals("(")) {
pilha.push(sequencia.get(i));
}
else {
pilha.pop();
}
i++;
}
return result && pilha.isEmpty();
}
}