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可视化排序算法:用Python看透排序过程

  • 2026-03-21 12:43:38
可视化排序算法:用Python看透排序过程

1. 冒泡排序(Bubble Sort)

直观解释:冒泡排序就像水中的气泡慢慢上升。它重复遍历数组,依次比较相邻两个元素,如果顺序错误就把它们交换。每一轮遍历都会把当前未排序部分中最大的元素“浮”到末尾,就像气泡冒到水面。

代码实现

import matplotlib.pyplot as pltimport numpy as npdef bubble_sort(arr):    n = len(arr)    for i in range(n-1):        for j in range(n-i-1):            if arr[j] > arr[j+1]:                arr[j], arr[j+1] = arr[j+1], arr[j]    return arrdef plot_sort(original, sorted_arr, title):    fig, (ax1, ax2) = plt.subplots(12, figsize=(104))    x = range(len(original))    ax1.bar(x, original, color='skyblue')    ax1.set_title('原始数组')    ax1.set_xticks(x)    ax2.bar(x, sorted_arr, color='lightgreen')    ax2.set_title('排序后数组')    ax2.set_xticks(x)    plt.suptitle(title)    plt.tight_layout()    plt.savefig(f'{title}.png', dpi=150)    plt.show()if __name__ == '__main__':    np.random.seed(42)  # 固定随机种子,让结果可重现    original = np.random.randint(110010)    sorted_arr = bubble_sort(original.copy())    plot_sort(original, sorted_arr, '冒泡排序')

2. 选择排序(Selection Sort)

直观解释:选择排序的思路很像我们在打牌时整理手牌:每次从未排序部分中找出最小的牌,放到已排序部分的末尾。具体来说,就是遍历数组,选出最小的元素与第一个位置交换,再从剩余部分选出最小的与第二个位置交换,以此类推。

代码实现

import matplotlib.pyplot as pltimport numpy as npdef selection_sort(arr):    n = len(arr)    for i in range(n):        min_idx = i        for j in range(i+1, n):            if arr[j] < arr[min_idx]:                min_idx = j        arr[i], arr[min_idx] = arr[min_idx], arr[i]    return arrdef plot_sort(original, sorted_arr, title):    fig, (ax1, ax2) = plt.subplots(12, figsize=(104))    x = range(len(original))    ax1.bar(x, original, color='skyblue')    ax1.set_title('原始数组')    ax1.set_xticks(x)    ax2.bar(x, sorted_arr, color='lightgreen')    ax2.set_title('排序后数组')    ax2.set_xticks(x)    plt.suptitle(title)    plt.tight_layout()    plt.savefig(f'{title}.png', dpi=150)    plt.show()if __name__ == '__main__':    np.random.seed(42)    original = np.random.randint(110010)    sorted_arr = selection_sort(original.copy())    plot_sort(original, sorted_arr, '选择排序')

3. 插入排序(Insertion Sort)

直观解释:插入排序和我们整理扑克牌的方式一模一样:从第二张牌开始,依次将当前牌插入到左边已经排好序的牌中的适当位置。插入时,比当前牌大的元素都向右移动一位,空出位置给当前牌。

代码实现

import matplotlib.pyplot as pltimport numpy as npdef insertion_sort(arr):    for i in range(1len(arr)):        key = arr[i]        j = i - 1        while j >= 0 and arr[j] > key:            arr[j+1] = arr[j]            j -= 1        arr[j+1] = key    return arrdef plot_sort(original, sorted_arr, title):    fig, (ax1, ax2) = plt.subplots(12, figsize=(104))    x = range(len(original))    ax1.bar(x, original, color='skyblue')    ax1.set_title('原始数组')    ax1.set_xticks(x)    ax2.bar(x, sorted_arr, color='lightgreen')    ax2.set_title('排序后数组')    ax2.set_xticks(x)    plt.suptitle(title)    plt.tight_layout()    plt.savefig(f'{title}.png', dpi=150)    plt.show()if __name__ == '__main__':    np.random.seed(42)    original = np.random.randint(110010)    sorted_arr = insertion_sort(original.copy())    plot_sort(original, sorted_arr, '插入排序')

4. 快速排序(Quick Sort)

直观解释:快速排序是“分治法”的典型代表:

  1. 从数组中选一个“基准”元素(比如第一个)。

  2. 把小于基准的放左边,大于基准的放右边,等于基准的可左可右。

  3. 对左右两部分递归执行上述步骤。这个过程就像在不断地“一分为二”,每一层都把问题规模减半。

代码实现

import matplotlib.pyplot as pltimport numpy as npdef quick_sort(arr):    if len(arr) <= 1:        return arr    pivot = arr[0]    left = [x for x in arr[1:] if x <= pivot]    right = [x for x in arr[1:] if x > pivot]    return quick_sort(left) + [pivot] + quick_sort(right)def plot_sort(original, sorted_arr, title):    fig, (ax1, ax2) = plt.subplots(12, figsize=(104))    x = range(len(original))    ax1.bar(x, original, color='skyblue')    ax1.set_title('原始数组')    ax1.set_xticks(x)    ax2.bar(x, sorted_arr, color='lightgreen')    ax2.set_title('排序后数组')    ax2.set_xticks(x)    plt.suptitle(title)    plt.tight_layout()    plt.savefig(f'{title}.png', dpi=150)    plt.show()if __name__ == '__main__':    np.random.seed(42)    original = np.random.randint(110010)    sorted_arr = quick_sort(original.copy())    plot_sort(original, sorted_arr, '快速排序')

5. 归并排序(Merge Sort)

直观解释:归并排序也是“分治法”的经典应用:

  1. 把数组从中间分成两半,分别对它们进行归并排序。

  2. 将两个已经有序的子数组合并成一个整体有序的数组。合并过程就像把两摞按大小排好的牌合并成一摞,每次从两摞顶部取较小的那张。

代码实现

import matplotlib.pyplot as pltimport numpy as npdef merge_sort(arr):    if len(arr) <= 1:        return arr    mid = len(arr) // 2    left = merge_sort(arr[:mid])    right = merge_sort(arr[mid:])    return merge(left, right)def merge(left, right):    result = []    i = j = 0    while i < len(left) and j < len(right):        if left[i] <= right[j]:            result.append(left[i])            i += 1        else:            result.append(right[j])            j += 1    result.extend(left[i:])    result.extend(right[j:])    return resultdef plot_sort(original, sorted_arr, title):    fig, (ax1, ax2) = plt.subplots(12, figsize=(104))    x = range(len(original))    ax1.bar(x, original, color='skyblue')    ax1.set_title('原始数组')    ax1.set_xticks(x)    ax2.bar(x, sorted_arr, color='lightgreen')    ax2.set_title('排序后数组')    ax2.set_xticks(x)    plt.suptitle(title)    plt.tight_layout()    plt.savefig(f'{title}.png', dpi=150)    plt.show()if __name__ == '__main__':    np.random.seed(42)    original = np.random.randint(110010)    sorted_arr = merge_sort(original.copy())    plot_sort(original, sorted_arr, '归并排序')

总结

算法
时间复杂度(平均)
空间复杂度
稳定性
冒泡排序
O(n²)
O(1)
稳定
选择排序
O(n²)
O(1)
不稳定
插入排序
O(n²)
O(1)
稳定
快速排序
O(n log n)
O(log n)
不稳定
归并排序
O(n log n)
O(n)
稳定
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  1. CONNECT:[ UseTime:0.000751s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001233s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000605s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000567s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001073s ]
  6. SELECT * FROM `set` [ RunTime:0.000431s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001124s ]
  8. SELECT * FROM `article` WHERE `id` = 480516 LIMIT 1 [ RunTime:0.000868s ]
  9. UPDATE `article` SET `lasttime` = 1774587473 WHERE `id` = 480516 [ RunTime:0.010013s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000483s ]
  11. SELECT * FROM `article` WHERE `id` < 480516 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000851s ]
  12. SELECT * FROM `article` WHERE `id` > 480516 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003948s ]
  13. SELECT * FROM `article` WHERE `id` < 480516 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001579s ]
  14. SELECT * FROM `article` WHERE `id` < 480516 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002432s ]
  15. SELECT * FROM `article` WHERE `id` < 480516 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003378s ]
0.108479s