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Problem Description A robot has been programmed to follow the instructions in its path. Instructions for the next direction the robot is to move are laid down in a grid. The possible instructions

Problem Description Chiaki often participates in international competitive programming contests. The time zone becomes a big problem. Given a time in Beijing time (UTC +8), Chiaki would lik...

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=6330 Problem Description Little Q likes solving math problems very much. Unluckily, however, he does not have good spatial ability. Everytime he...

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=6342Problem DescriptionKazari remembered that she had an expression s0 before.Definition of expression is given below in Backus–Naur form.<expre...