I'd like to share an interesting thing with you all — I find a problem which has less testcases in practice room than in an official contest. This problem is Substitutes in Number (I don't know if there are other problems like this or not.)

Take a look at this submission : LINK.It has 39 testcases.

However in an official contest, this problems has 50 testcases. Take a look at any accepted submissions in the contest, you can find out. Here's a sample LINK.

So I am curious why there are 11 testcases missing.

Did admin know that?

Interesting, isn't it? :D