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囧,每个board输出完毕后还要输出一个空行(样例没输出,变态),还有就是判断扩展条件时容易把目标也给排除掉(因为目标也是‘X’),从而造成任何样例均输出“impossible”

Posted by Pzjay at 2009-08-25 21:54:24 on Problem 1101


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