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题目链接：http://poj.org/problem?id=1426 Description Given a positive integer n, write a program to find out a nonzero multiple m of n whose decimal representation contains only the digits 0 and 1. You m...

题目链接：http://poj.org/problem?id=3126 Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room...