XMzhou的专栏

Red and BlackTime Limit: 1000MS Memory Limit: 30000KTotal Submissions: 19668 Accepted: 10514DescriptionThere is a rectangular room, covered with square tiles. Eac

Stealing Harry Potter's PreciousTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 129    Accepted Submission(s): 66Problem Description

Arithmetic ProgressionsAn arithmetic progression is a sequence of the form a, a+b, a+2b, ..., a+nb where n=0,1,2,3,... . For this problem, a is a non-negative integer and b is a positive integer.

Checker ChallengeExamine the 6x6 checkerboard below and note that the six checkers are arranged on the board so that one and only one is placed in each row and each column, and there is never more