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use rowZero, colZero来记录第一行第一列是否含有0然后遍历其他的行和列,若为0,则matix[i][0], matrix[0][j]都设为0然后再遍历第一行第一列,把为0 的全部设为0最后根据rowZero和colZero来设第一行和第一列
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