Hello everyone, can somebody please tell if there is some issue with the recently added GNU G++17 9.2.0(64 bit, msys 2) compiler? Because it costed me 3 wrong submissions and 10 minutes of time in yesterday's contest. I was submitting the code to the 2nd answer and it gave me WA 3 times, before I changed the compiler to GNU G++17(7.3.0) and it got accepted.
And this is not the first time, this has happened quite a lot of times.
Hence, I wanted to know, if something needs to be imparted into my code, before submitting using that compiler or is it just because of that compiler. Thank you, in advance!
if (*lower_bound(a, a + n, x) == x)I think this is undefined if lower_bound() returns a+n.
Yes, it will, if x is not found, I think. If that is the problem, why other compilers are not reporting it?
Undefined behaviour is literally that, undefined. It can give the correct answer, wrong answer, time out, erase your hard disk, anything. Always beware.
The return of lower_bound() is ok, but that array is not initialized at position n. There can be x or any other value.