diff --git a/codes/python/chapter_searching/binary_search.py b/codes/python/chapter_searching/binary_search.py index 709a2b6..0f37478 100644 --- a/codes/python/chapter_searching/binary_search.py +++ b/codes/python/chapter_searching/binary_search.py @@ -1,10 +1,51 @@ ''' File: binary_search.py -Created Time: 2022-11-25 -Author: Krahets (krahets@163.com) +Created Time: 2022-11-26 +Author: timi (xisunyy@163.com) ''' import sys, os.path as osp sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__)))) from include import * +""" 二分查找(双闭区间) """ +def binary_search(nums, target): + # 初始化双闭区间 [0, n-1] ,即 i, j 分别指向数组首元素、尾元素 + i, j = 0, len(nums) - 1 + while i <= j: + m = (i + j) // 2 # 计算中点索引 m + if nums[m] < target: # 此情况说明 target 在区间 [m+1, j] 中 + i = m + 1 + elif nums[m] > target: # 此情况说明 target 在区间 [i, m-1] 中 + j = m - 1 + else: + return m # 找到目标元素,返回其索引 + return -1 # 未找到目标元素,返回 -1 + + +""" 二分查找(左闭右开) """ +def binary_search1(nums, target): + # 初始化左闭右开 [0, n) ,即 i, j 分别指向数组首元素、尾元素+1 + i, j = 0, len(nums) + # 循环,当搜索区间为空时跳出(当 i = j 时为空) + while i < j: + m = (i + j) // 2 # 计算中点索引 m + if nums[m] < target: # 此情况说明 target 在区间 [m+1, j) 中 + i = m + 1 + elif nums[m] > target: # 此情况说明 target 在区间 [i, m) 中 + j = m + else: # 找到目标元素,返回其索引 + return m + return -1 # 未找到目标元素,返回 -1 + + +if __name__ == '__main__': + target = 6 + nums = [1, 3, 6, 8, 12, 15, 23, 67, 70, 92] + + # 二分查找(双闭区间) + index = binary_search(nums, target) + print("目标元素 6 的索引 = ", index) + # 二分查找(左闭右开) + index = binary_search1(nums, target) + print("目标元素 6 的索引 = ", index) diff --git a/codes/python/chapter_searching/hashing_search.py b/codes/python/chapter_searching/hashing_search.py index 90de74f..fab8f34 100644 --- a/codes/python/chapter_searching/hashing_search.py +++ b/codes/python/chapter_searching/hashing_search.py @@ -1,10 +1,41 @@ ''' File: hashing_search.py -Created Time: 2022-11-25 -Author: Krahets (krahets@163.com) +Created Time: 2022-11-26 +Author: timi (xisunyy@163.com) ''' import sys, os.path as osp sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__)))) from include import * +""" 哈希查找(数组) """ +def hashing_search(map,target): + # 哈希表的 key: 目标元素,value: 索引 + # 若哈希表中无此 key ,返回 -1 + return map.get(target,-1) + +""" 哈希查找(链表) """ +def hashing_search1(map,target): + # 哈希表的 key: 目标元素,value: 节点对象 + # 若哈希表中无此 key ,返回 -1 + return map.get(target,-1) + +if __name__=='__main__': + target=3 + # 哈希查找(数组) + nums=[1, 5, 3, 2, 4, 7, 5, 9, 10, 8] + map=dict() # 初始化哈希表 + for i in range(len(nums)): + map[nums[i]]=i # key: 元素,value: 索引 + index=hashing_search(map,target) + print("目标元素 3 的索引 = " ,index) + + # 哈希查找(链表) + head=list_to_linked_list(nums) + map1=dict() # 初始化哈希表 + while head: + map1[head.val]=head # key: 结点值,value: 结点 + head=head.next + + node=hashing_search1(map1,target) + print("目标结点值 3 的对应结点对象为 " , node) diff --git a/codes/python/chapter_searching/linear_search.py b/codes/python/chapter_searching/linear_search.py index 961e75f..d423dad 100644 --- a/codes/python/chapter_searching/linear_search.py +++ b/codes/python/chapter_searching/linear_search.py @@ -1,10 +1,38 @@ ''' File: linear_search.py -Created Time: 2022-11-25 -Author: Krahets (krahets@163.com) +Created Time: 2022-11-26 +Author: timi (xisunyy@163.com) ''' import sys, os.path as osp sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__)))) from include import * +""" 线性查找(数组) """ +def linear_search(nums,target): + # 遍历数组 + for i in range(len(nums)): + if nums[i]==target: # 找到目标元素,返回其索引 + return i + return -1 # 未找到目标元素,返回 -1 + +""" 线性查找(链表) """ +def linear_search_by_link(head,target): + # 遍历链表 + while head: + if head.val==target: # 找到目标结点,返回之 + return head + head=head.next + return None # 未找到目标结点,返回 None (Python为None) + +if __name__=='__main__': + target=3 + # 在数组中执行线性查找 + nums=[1, 5, 3, 2, 4, 7, 5, 9, 10, 8] + index=linear_search(nums,target) + print("目标元素 3 的索引 = " ,index) + + # 在链表中执行线性查找 + head=list_to_linked_list(nums) + node=linear_search_by_link(head,target) + print("目标结点值 3 的对应结点对象为 " ,node)