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public class SqStack {
     private int size;
     private Object[] datas;
     private int top;
     public SqStack(){
          this(50);
          size = 50;
     }
     public SqStack(int size) {
          this.size = size;
          datas = new Object[size];
          top = -1;
     }
     public void push(Object data){
          //...
     }
     public Object pop(){
          //...
     }
     public Object getTop(){
          //...
     }
     public boolean isEmpty(){
          //...
     }
}
public static boolean isStackOutSequence(String str){
     SqStack s=new SqStack();
     for(int i=0;i<str.length();i++){
          for(int j=i+1;j<str.length();j++){
              if(str.charAt(j)<str.charAt(i)){


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