セットを使用して3つのリストから共通の要素を見つけるPythonプログラム

3つのユーザー入力リストが与えられた場合、私たちのタスクは、これら3つのリストから共通の要素を見つけることです。ここでは交差法を適用しています。

例

Input
A=[2, 3, 4, 5, 6]
B=[2, 3, 7, 6, 90]
C=[2, 3, 45, 34]
Common elements=[2, 3]

アルゴリズム

Step1: input the elements of three lists.
Step2: Use intersection method, first convert lists to sets then apply intersection method of two sets and find out common elements then this set intersect with the third set.

サンプルコード

def common_ele(my_A, my_B, my_C):
   my_s1 = set(my_A)
   my_s2 = set(my_B)
   my_s3 = set(my_C)
   my_set1 = my_s1.intersection(my_s2)
   output_set = my_set1.intersection(my_s3)
   output_list = list(output_set)
   print(output_list)
if __name__ == '__main__' :
# First List
A=list()
n=int(input("Enter the size of the List"))
print("Enter the number")
for i in range(int(n)):
   p=int(input("Size="))
   A.append(int(p))
   print (A)
   # Second List
   B=list()
n1=int(input("Enter the size of the List"))
print("Enter the number")
for i in range(int(n1)):
   p=int(input("Size="))
   B.append(int(p))
   print (B)
   # Third Array
   C=list()
n2=int(input("Enter the size of the List"))
print("Enter the number")
for i in range(int(n2)):
   p=int(input("Size="))
   C.append(int(p))
   print (C)
   # Calling Function
   common_ele(A, B, C)

出力

Enter the size of the List 3
Enter the number
Size= 2
[2]
Size= 1
[2, 1]
Size= 2
[2, 1, 2]
Enter the size of the List 3
Enter the number
Size= 2
[2]
Size= 1
[2, 1]
Size= 4
[2, 1, 4]
Enter the size of the List 4
Enter the number
Size= 3
[3]
[]
Size= 2
[3, 2]
[2]
Size= 1
[3, 2, 1]
[1, 2]
Size= 3
[3, 2, 1, 3]
[1, 2]