1#定义一个二分查找的普通方法,传入两个参数,一个是列表list1,一个是要查找的值value 2defbinary_search_normal(list1,value):3#拿到列表的长度4length=len(list1)5#列表的开始值索引6start=07#列表的结束值索引8end=length-19#while循环遍历10whilestart<end:11#获取列表中间位的索引值12middle=(end+start...
https://www.geeksforgeeks.org/binary-search-bisect-in-python/ https://www.geeksforgeeks.org/bisect-algorithm-functions-in-python/ Binary Search 是一种用于搜索已排序列表中元素的技术。在本文中,我们将研究执行Binary Search 的库函数。 1.查找元素的首次出现 bisect.bisect_left(a,x,lo = 0,hi = l...
我们分别用递归和循环来实现二分查找: defbinary_search_recursion(lst, value, low, high):ifhigh < low:returnNonemid = (low + high) /2iflst[mid] > value:returnbinary_search_recursion(lst, value, low, mid-1)eliflst[mid] < value:returnbinary_search_recursion(lst, value, mid+1, high)els...
defbin_search(data_list, val): low= 0#最小数下标high = len(data_list) - 1#最大数下标whilelow <=high: mid= (low + high) // 2#中间数下标 //向下取整ifdata_list[mid] == val:#如果中间数下标等于val, 返回returnmidelifdata_list[mid] > val:#如果val在中间数左边, 移动high下标high ...
假设有一个非常大的单词列表，并且想要根据给定的前缀查找单词：def prefix_search(wordlist, prefix):try:index = bisect_left(wordlist, prefix)return wordlist[index].startswith(prefix)except IndexError:return Falsewords = ['another', 'data', 'date', 'hello', 'text', 'word']print(prefix_search...
search 插值算法的函数 def ipolatesearch(list, target): start = 0 ##第一个list元素的index,0 end = len(list) - 1 ##最后一个list元素的index,长度-1 found = False ##found=False表示还没找到 while start <= end and not found: midpoint = start + int((target-list[start])/(list[end]-...
value = (key - list[low])/(list[high] - list[low]) 用这个value来代替二分查找中的1/2。 上面的代码可以直接使用,只需要改一句。 # 插值查找算法 # 时间复杂度O(log(n)) def binary_search(lis, key): low = 0 high = len(lis) - 1 time = 0 while low < high: time += 1 # 计算...
def bin_search(data_list, val): low = 0 # 最小数下标 high = len(data_list) - 1 # 最大数下标 while low <= high: mid = (low + high) // 2 # 中间数下标 //向下取整 if data_list[mid] == val: # 如果中间数下标等于val, 返回 ...
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 my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] target_value = 6 result = binary_search(my_list, target_value) if resul...
例如,我们可以使用以下代码在一个有序list中查找一个数字:_x000D_ `python_x000D_ my_list = [1, 2, 3, 4, 5]_x000D_ index = binary_search(my_list, 3)_x000D_ print(index) # 输出 2_x000D_ _x000D_ 三、常见问题解答_x000D_ 1. 如何判断list是否为空?_x000D_ 可以使...