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Python program to find number of likes and dislikes
• Last Updated : 30 Jan, 2020

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.

 `# 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
```

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