编写程序以升序对堆栈进行排序 [英] Write a program to sort a stack in ascending order

问题描述

有人可以帮忙看看我的代码吗?非常感谢你的帮助.输入堆栈是 [5, 2, 1, 9, 0, 10]，我的代码给出了输出堆栈 [0, 9, 1, 2, 5, 10]，9 不在正确的位置.

Can someone help look at my code, please? Thank you so much for your help. The input stack is [5, 2, 1, 9, 0, 10], my codes gave output stack [0, 9, 1, 2, 5, 10], 9 is not in the right position.

import java.util.*;

public class CC3_6 {
public static void main(String[] args) {
    int[] data = {5, 2, 1, 9, 0, 10};
    Stack<Integer> myStack = new Stack<Integer>();
    for (int i = 0; i < data.length; i++){
        myStack.push(data[i]);
    }
    System.out.println(sortStack(myStack));
}

public static Stack<Integer> sortStack(Stack<Integer> origin) {
    if (origin == null)
        return null;
    if (origin.size() < 2)
        return origin;

    Stack<Integer> result =  new Stack<Integer>();
    while (!origin.isEmpty()) {
        int smallest = origin.pop();
        int remainder = origin.size();
        for (int i = 0; i < remainder; i++) {
            int element = origin.pop();
            if (element < smallest) {
                origin.push(smallest);
                smallest = element;                    
            } else {
                origin.push(element);
            }
        }
        result.push(smallest);
    }
    return result;

}

}

推荐答案

这是我的代码版本，非常简单易懂.

Here's my version of the code which is pretty straightforward to follow.

import java.util.Stack;

public class StackSorting {

    public static void main(String[] args) {
        Stack<Integer> stack = new Stack<Integer>();

        stack.push(12);
        stack.push(100);
        stack.push(13);
        stack.push(50);
        stack.push(4);

        System.out.println("Elements on stack before sorting: "+ stack.toString());

        stack = sort(stack);

        System.out.println("Elements on stack after sorting: "+ stack.toString());

    }

    private static Stack<Integer> sort(Stack<Integer> stack) {

        if (stack.isEmpty()) {
            return null;
        }

        Stack<Integer> sortedStack = new Stack<Integer>();

        int element = 0;
        while(!stack.isEmpty()) {
            if (stack.peek() <= (element = stack.pop())) {
                if (sortedStack.isEmpty()) {
                    sortedStack.push(element);
                } else {
                    while((!sortedStack.isEmpty()) && sortedStack.peek() > element) {
                        stack.push(sortedStack.pop());
                    }
                    sortedStack.push(element);
                }
            }
        }

        return sortedStack;
    }
}

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