Wrong answer for 2nd test case and correct for the rest.
Where am I making a mistake?
CODE: import java.util.*;
public class Main {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
Scanner s = new Scanner(System.in);
String str = s.next();
Main mainobj = new Main();
StacksUsingArrays stack = mainobj.new StacksUsingArrays(1000);
if (isBalanced(str, stack)) {
System.out.println("Yes");
} else {
System.out.println("No");
}
}
public static boolean isBalanced(String str, StacksUsingArrays stack) throws Exception {
for(int i = 0; i < str.length(); i++) {
if(str.charAt(i) == ')') {
if(!stack.isEmpty() && str.charAt(stack.tos) == '(') {
stack.pop();
}
else {
stack.push(str.charAt(i));
}
}
else {
stack.push(str.charAt(i));
}
}
if(stack.isEmpty())
return true;
else
return false;
}
private class StacksUsingArrays {
private int[] data;
private int tos;
public static final int DEFAULT_CAPACITY = 10;
public StacksUsingArrays() throws Exception {
// TODO Auto-generated constructor stub
this(DEFAULT_CAPACITY);
}
public StacksUsingArrays(int capacity) throws Exception {
if (capacity <= 0) {
System.out.println("Invalid Capacity");
}
this.data = new int[capacity];
this.tos = -1;
}
public int size() {
return this.tos + 1;
}
public boolean isEmpty() {
if (this.size() == 0) {
return true;
} else {
return false;
}
}
public void push(int item) throws Exception {
if (this.size() == this.data.length) {
throw new Exception("Stack is Full");
}
this.tos++;
this.data[this.tos] = item;
}
public int pop() throws Exception {
if (this.size() == 0) {
throw new Exception("Stack is Empty");
}
int retVal = this.data[this.tos];
this.data[this.tos] = 0;
this.tos--;
return retVal;
}
public int top() throws Exception {
if (this.size() == 0) {
throw new Exception("Stack is Empty");
}
int retVal = this.data[this.tos];
return retVal;
}
public void display() throws Exception {
if (this.size() == 0) {
throw new Exception("Stack is Empty");
}
for (int i = this.tos; i >= 0; i--) {
System.out.println(this.data[i]);
}
}
}
}