All about problems in Volume 12. 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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Use this thread to discuss this problem.
Check input and AC output for thousands of problems on uDebug
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OK, I do a BFS with bitmasks, each word being encoded with an at most 50-bit unsigned long long... Result: TLE. Question: what else needs to be done apart from BFS?