All about problems in Volume 109. If there is a thread about your problem, please use it. If not, create one with its number in the subject.
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I have a problem , i'm totally confuse. Suggest some good idea or design..............
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Think of how many valid ways you can build a 2 by 2 by 2 cube with just one corner fixed: T13/F13/R11
Check input and AC output for thousands of problems on uDebug