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+ package leetcode ;
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+
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+ import java .util .LinkedList ;
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+ import java .util .Queue ;
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+
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+ public class ImplementStackQueues {
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+ public static void main (String [] args ){
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+ MyStack stack = new MyStack ();
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+ stack .push (1 );
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+ stack .push (2 );
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+ stack .push (3 );
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+ System .out .println (stack .top ());
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+ }
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+ }
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+
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+ class MyStack {
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+ Queue <Integer > q = new LinkedList ();
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+ /** Initialize your data structure here. */
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+ public MyStack () {
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+
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+ }
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+
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+ /** Push element x onto stack. */
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+ public void push (int x ) {
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+ q .offer (x );
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+ int n = q .size ()-1 ;
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+ for (int i =0 ;i < n ;i ++){
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+ q .offer (q .poll ());
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+ }
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+ }
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+
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+ /** Removes the element on top of the stack and returns that element. */
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+ public int pop () {
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+ return q .poll ();
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+ }
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+
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+ /** Get the top element. */
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+ public int top () {
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+ return q .peek ();
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+ }
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+
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+ /** Returns whether the stack is empty. */
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+ public boolean empty () {
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+ return q .isEmpty ();
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+ }
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+ }
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