Doubt in the Editorial of Sort game

what is the use of bool operator>() function in the solution ?
The code that i wrote is very much similar other than the operator function and my code works fine for the sample test given ,but could not pass the other test cases.

bool operator>()

is used for operator overloading, although need not to overload > operator, as it is still performing the same operation.
Please provide me your code so that i can tell you your mistake.