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hdu 4975 A simple Gaussian elimination problem.（网络流，判断矩阵是否存在）

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Problem Description Dragon is studying math. One day, he drew a table with several rows and columns, randomly wrote numbers on each elements of the table. Then he counted the sum of each row and column. Since he thought the map will be useless after he got the sums, he destroyed the table after that.Dragon is studying math. One d

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