at the last "Div 2" round i sent solution for problem b but i get Wrong answer on test 2 ....I spend a lot of time try to discover why my idea is wrong?!! actually my idea and my code was true , but because (sqrt function do not work in GNU 20 with long long number and same function work with GNU 17 i get wrong answer and my rate will decrase more than 150 point,** so please if you know some issues like this, please type it in the comment to know it , especially in differences between these two compilers**
my code AC on GNU 17 , WA on GNU 20
