hi im trying to solve problem 120 in acm.sgu.ru (http://acm.sgu.ru/problem.php?contest=0&problem=120) i get runtime error but i dont know why can any one help ?? this is my code http://pastebin.com/u8c7ULsv thanks in advance :)

i get presentation error on test 11 on problem 304 sgu(http://acm.sgu.ru/problem.php?contest=0&problem=304) my biggest problem is i dont know what pe exactly is !! can anyone help ?? this is my code http://paste.ubuntu.com/6489024/

i have trouble understanding this problem . can any one explain? thanks :)