given an initially empty hash table ht with length 7, together with a hash function h(k)=k%7. let us use linear probing to solve collisions. what is the average search length for successful searches after inserting 22, 43, 15 one by one into ht?

给定一个长度为7的初始为空的哈希表ht，哈希函数为h(k)=k%7。我们使用线性探测来解决哈希冲突问题。在依次将22、43、15插入ht后，成功搜索的平均搜索长度是多少？

答：成功搜索的平均搜索长度为1.5。

相关问题

Use java to write a program to display a progress meter as follows. The meter consists of a windowCreate functionality to simulate steps of 10% progress. For this the user repeatedly presses return on the console inside Eclipse (use a Scanner object for this). Every time, the top-most red label is changed to green and the progress label value is incremented by 10 until that value is 100%. Make sure that no errors occur if the user tries to go past 100%. with a column of 11 labels. The first 10 labels indicate progress steps of 10% and are initially red. The bottom label shows the amount of activity remaining as a textual percentage, and is initially set to “0%”.

Sure, here's an example program in Java that implements the progress meter functionality you described:

import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Color;
import java.awt.GridLayout;

public class ProgressMeter {
    private static final int NUM_STEPS = 10;
    private static final String[] STEP_LABELS = {"0%", "10%", "20%", "30%", "40%", "50%", "60%", "70%", "80%", "90%", "100%"};
    private static final Color RED = Color.RED;
    private static final Color GREEN = Color.GREEN;
    
    private JFrame frame;
    private JLabel[] stepLabels;
    private JLabel progressLabel;
    private int currentStep;
    
    public ProgressMeter() {
        frame = new JFrame("Progress Meter");
        JPanel panel = new JPanel(new GridLayout(NUM_STEPS + 1, 1));
        stepLabels = new JLabel[NUM_STEPS];
        for (int i = 0; i < NUM_STEPS; i++) {
            JLabel label = new JLabel(STEP_LABELS[i], JLabel.CENTER);
            label.setForeground(RED);
            panel.add(label);
            stepLabels[i] = label;
        }
        progressLabel = new JLabel("0%", JLabel.CENTER);
        panel.add(progressLabel);
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
        currentStep = 0;
    }
    
    public void updateProgress() {
        if (currentStep < NUM_STEPS) {
            stepLabels[currentStep].setForeground(GREEN);
            currentStep++;
            progressLabel.setText(currentStep * 10 + "%");
        }
    }
    
    public static void main(String[] args) {
        ProgressMeter meter = new ProgressMeter();
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("Press enter to simulate progress...");
            scanner.nextLine();
            meter.updateProgress();
        }
    }
}

This program creates a `ProgressMeter` class that encapsulates the progress meter GUI and functionality. The constructor initializes the GUI with 11 `JLabel` components arranged in a `GridLayout`, with the first 10 labels representing the progress steps and the bottom label representing the progress percentage. The `updateProgress` method updates the GUI by changing the color of the current step label to green, incrementing the current step count, and updating the progress label text. The `main` method creates a new `ProgressMeter` instance and repeatedly waits for the user to press enter before calling the `updateProgress` method to simulate progress.

Many GUI applications have meters that indicate the progress made so far towards completing an activity as a percentage of the anticipated total activity. Write a program to display a progress meter as follows. The meter consists of a window with a column of 11 labels. The first 10 labels indicate progress steps of 10% and are initially red. The bottom label shows the amount of activity remaining as a textual percentage, and is initially set to “0%”. Then create functionality to simulate steps of 10% progress. For this the user repeatedly presses return on the console inside Eclipse (use a Scanner object for this). Every time, the top-most red label is changed to green and the progress label value is incremented by 10 until that value is 100%. Make sure that no errors occur if the user tries to go past 100%.

Sure, here's a sample Java program that implements the progress meter as described:

import java.awt.Color;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.util.Scanner;

public class ProgressMeter {
    private static final int NUM_STEPS = 10;
    private static final String TITLE = "Progress Meter";
    private static final int WIDTH = 200;
    private static final int HEIGHT = 300;
    private static final Color RED = Color.RED;
    private static final Color GREEN = Color.GREEN;
    private static final String REMAINING_LABEL = "Remaining: ";
    
    private JFrame frame;
    private JLabel[] stepLabels;
    private JLabel remainingLabel;
    private int currentStep;
    
    public ProgressMeter() {
        frame = new JFrame(TITLE);
        frame.setSize(WIDTH, HEIGHT);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new GridLayout(NUM_STEPS + 1, 1));
        
        stepLabels = new JLabel[NUM_STEPS];
        for (int i = 0; i < NUM_STEPS; i++) {
            stepLabels[i] = new JLabel(i*10 + "%", JLabel.CENTER);
            stepLabels[i].setOpaque(true);
            stepLabels[i].setBackground(RED);
            frame.add(stepLabels[i]);
        }
        
        remainingLabel = new JLabel(REMAINING_LABEL + "0%", JLabel.CENTER);
        frame.add(remainingLabel);
        
        currentStep = 0;
    }
    
    public void setVisible(boolean visible) {
        frame.setVisible(visible);
    }
    
    public void simulateProgress() {
        Scanner scanner = new Scanner(System.in);
        while (currentStep < NUM_STEPS) {
            String input = scanner.nextLine();
            if (input.equals("")) {
                currentStep++;
                stepLabels[currentStep - 1].setBackground(GREEN);
                remainingLabel.setText(REMAINING_LABEL + currentStep*10 + "%");
            }
            if (currentStep == NUM_STEPS) {
                System.out.println("Progress completed.");
            }
        }
    }
    
    public static void main(String[] args) {
        ProgressMeter pm = new ProgressMeter();
        pm.setVisible(true);
        pm.simulateProgress();
    }
}

The program creates a `JFrame` with a `GridLayout` containing 11 `JLabel` components, where the first 10 labels are the progress steps of 10% and the bottom label shows the remaining percentage. The labels are initialized to red, and as the user presses the enter key, the top-most red label is changed to green and the remaining percentage label is updated accordingly. The program uses a `Scanner` object to read user input from the console inside Eclipse. The program terminates when the progress reaches 100%.