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# Python program to find number of likes and dislikes

Alice and Bob made a list of topics and both of them voted if they like or dislike the topic. They wrote 0 to denote dislike and 1 to denote like. The task is to count the number of topics that both of them like or dislike. Examples:

Input: alice = “010101” bob = “101101” Output: 3 alice and bob both like 4th and 6th topics and dislike the 5th topic. Hence, the output is 3. Input: alice = “111111” bob = “000000” Output: 0 There are no common likes or dislikes between alice and bob. Hence, the output is 0.

Input: alice = “110000” bob = “110011” Output: 4 alice and bob both like 1st and 2nd topics and dislike 3rd and 4th topics. Hence, the result is 4.

Approach:

• First, we have to iterate through each character of the string consisting of the likes and dislikes of alice.
• Then, we have to compare it with the corresponding entry of the string consisting of the likes and dislikes of bob.
• Finally, we will count the number of similar entries and print.

Below is the implementation.

## Python3

 # function to obtain no # of topics both alice and # bob like def commontopics(alice, bob):     # initiate count with 0  count = 0     # iterating through alice  for i in range(0,len(alice)):       # comparing with corresponding   # bob entry   if alice[i] == bob[i]:         # counting similar entries    count += 1       # printing the count    print(count)   #main function def main():     commontopics("010101", "101101")  commontopics("111111", "000000")  commontopics("110000", "110011")      # driver code if __name__ == "__main__":  main()   # This code is contributed by SrujayReddy

Output:

3
0
4

The Time and Space Complexity for all the methods are the same:

Time Complexity: O(n)

Space Complexity: O(n)

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