Is there any massive time complexity difference between erasing a value from the set using -- set_name.erase(iterator) and set_name.erase(set_name.find(iterator)) when we are sure that iterator refers to a value present in the set..i am asking this because this shows time limit exceeded but this one does not shows any time limit exceeded ...please help

can anyone tell me why does it show that reference is ambiguous on custom invocation of codeforces although it works fine on sublime and when i just change the name of array it works fine .. ... code link...

...thank you