"font-size: 14pt">n</span><span style="font-size: 14pt">行</span><span style="font-size: 14pt">m</span><span style="font-size: 14pt">列的矩阵</span><span style="font-size: 14pt">B</span><span style="font-size: 14pt">。</span><span style="font-size: 14pt">B</span><span style="font-size: 14pt">ij</span><span style="font-size: 14pt">=1</span><span style="font-size: 14pt">如果第</span><span style="font-size: 14pt">i</span><span style="font-size: 14pt">只河蟹不能和第</span><span style="font-size: