One nitpick (and this applies to almost every site of this genre, i.e. geeksforgeeks, hackerrank, etc.):
The code listed as "C++" is essentially C with ostreams. If I were interviewing someone and they claimed to know C++, and then used "sizeof(A) / sizeof(A[0])" to get the size of an array, I'd question how much C++ they actually knew. I understand that the focus here is mainly on problem solving and not language specific patterns, but when you advertise the site as a coding interview helper I think that the solution code should reflect that which should be written in an actual interview.
The code listed as "C++" is essentially C with ostreams. If I were interviewing someone and they claimed to know C++, and then used "sizeof(A) / sizeof(A[0])" to get the size of an array, I'd question how much C++ they actually knew. I understand that the focus here is mainly on problem solving and not language specific patterns, but when you advertise the site as a coding interview helper I think that the solution code should reflect that which should be written in an actual interview.