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虽然知道这个时候此帖必沉。。。但是还是要发。。。请教诸位大牛一个疑似NP证明问题。。。一个n*m的0/1矩阵，是否存在p*q的全1子阵（不连续也可）？ 如果不是NP/NPC，给个多项式算法，如果是NP/NPC，给个证明。 thx诸位。。。 Followed by:
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