Python实现排序算法、查找算法和图遍历算法实例

def bubble_sort(arr):
    n = len(arr)
    for i in range(n):
        for j in range(0, n-i-1):
            if arr[j] > arr[j+1]:
                arr[j], arr[j+1] = arr[j+1], arr[j]
# 示例用法
arr = [64, 34, 25, 12, 22, 11, 90]
bubble_sort(arr)
print("排序后的数组:", arr)

def binary_search(arr, target):
    low = 0
    high = len(arr) - 1
    while low <= high:
        mid = (low + high) // 2
        if arr[mid] == target:
            return mid
        elif arr[mid] < target:
            low = mid + 1
        else:
            high = mid - 1
    return -1
# 示例用法
arr = [2, 5, 8, 12, 16, 23, 38, 56, 72, 91]
target = 23
result = binary_search(arr, target)
if result != -1:
    print("目标元素在索引", result)
else:
    print("目标元素不在数组中")

# 定义图的邻接表表示
graph = {
    'A': ['B', 'C'],
    'B': ['D', 'E'],
    'C': ['F'],
    'D': [],
    'E': ['F'],
    'F': []
}
visited = set()
def dfs(graph, node):
    if node not in visited:
        print(node, end=" ")
        visited.add(node)
        for neighbor in graph[node]:
            dfs(graph, neighbor)
# 示例用法
dfs(graph, 'A')