A: I submitted my code to problem B and I was redirected to my submissions page there were no entries in the submissions page ! I had to refresh the page to see my submission !

Edit : also after refreshing the page again I saw the same submission which already had WA verdict re-running the pretests again and surely gave the same WA !

B: These two submissions (Problem B) :

21448936

21449637

the only difference is that in the first one I used :

while(scanf("%c" , &c)==1)

to get all the characters from the input and I got "Wrong answer on pretest 1"

in the second one I used the c++ cin to get the whole string first then process it :

cin>>s;

and I got "Pretests passed" costing me +7 minutes to get it accepted :(

why did this happen ????? thought scanf() works until it reaches end of file !