• leetcode349之实现求解两个数组的交集


    ##四种方式求解:

      1 # 给定两个数组,编写一个函数来计算它们的交集
      2 
      3 
      4 def intersection(nums1, nums2):
      5     '''
      6     给定两个数组,编写一个函数来计算它们的交集
      7     :param nums1: list
      8     :param nums2: list
      9     :return:
     10     '''
     11     nums1 = set(nums1)
     12     nums2 = set(nums2)
     13     temp_array = []
     14     for i in nums1:
     15         if i in nums2:
     16             temp_array.append(i)
     17 
     18     return temp_array
     19 
     20 
     21 print('_________测试intersection()________________')
     22 nums1 = [1, 2, 3, 2, 4, 2] 24 nums2 = [2, 3, 2, 1, 2, 4, 5, 2]
     25 temp_array = intersection(nums1, nums2)
     26 print("temp_array=", temp_array)
     27 
     28 
     29 def intersection2(nums1, nums2):
     30     '''
     31     方法二
     32     :param nums1:
     33     :param nums2:
     34     :return:
     35     '''
     36     temp_array = []
     37     for i in nums1:
     38         if i in nums2:
     39             if i not in temp_array:
     40                 temp_array.append(i)
     41     return temp_array
     42 
     43 
     44 print('-----------测试intersection2()-------------')
     45 array = intersection2(nums1, nums2)
     46 print('array=', array)
     47 
     48 
     49 def binarySearch(nums, target):
     50     '''
     51     二分查找法
     52     :param nums:
     53     :param target:
     54     :return:
     55     '''
     56     left = 0
     57     right = len(nums) - 1
     58     while left <= right:
     59         mid = left + (right - left) // 2
     60         if nums[mid] == target:
     61             return True
     62         elif nums[mid] < target:
     63             left = mid + 1
     64         else:
     65             right = mid - 1
     66 
     67     return False
     68 
     69 
     70 def intersection3(nums1, nums2):
     71     '''
     72 
     73     :param nums1:
     74     :param nums2:
     75     :return:
     76     '''
     77     return set(nums1) & set(nums2)
     78 
     79 
     80 print('+++++++++测试intersection3()+++++++++++++')
     81 array = intersection3(nums1, nums2)
     82 print("array=", array)
     83 
     84 
     85 def intersections4(nums1, nums2):
     86     '''
     87 
     88     :param nums1:
     89     :param nums2:
     90     :return:
     91     '''
     92     nums1 = sorted(nums1)
     93     array4 = []
     94     for i in nums2:
     95         if i not in array4:
     96             if binarySearch(nums1, i):
     97                 array4.append(i)
     98 
     99     return array4
    100 
    101 
    102 print("=================测试interSearch()===========")
    103 array4 = intersections4(nums1, nums2)
    104 print('array4=', array4)

    输出:

    _________测试intersection()________________
    sorted nums1= [1, 2, 2, 2, 3, 4]
    temp_array= [1, 2, 3, 4]
    -----------测试intersection2()-------------
    array= [1, 2, 3, 4]
    +++++++++测试intersection3()+++++++++++++
    array= {1, 2, 3, 4}
    =================测试interSearch()===========
    array4= [2, 3, 1, 4]
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  • 原文地址:https://www.cnblogs.com/rounie/p/12977314.html
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