# 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.

 `# 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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